Implement extension permission dialog experiments.

This CL implements the 12 different screens in the mocks at
http://go/crx-dialog-experiment. Screenshots from the
implementation are at http://go/crx-dialog-experiment-screenshots.

BUG=326733
NOTRY=true

Review URL: https://codereview.chromium.org/103863009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242657 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/generated_resources.grd

@@ -5066,6 +5066,56 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_EXTENSIONS_DETAILS" desc="Tooltip for the button next to an extension that toggles showing details">
         Details
       </message>
+
+      <!-- Strings for the extensions permission dialog experiment -->
+      <!-- TODO(meacer): Remove these once the experiments are completed. -->
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION1">
+        Do you trust this extension to use these privileges safely?
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION2">
+        Once installed, this extension could potentially use these privileges to do malicious things to your web browsing experience. Are you sure you want to install this extension?
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION3">
+        Are you sure you want to install this extension given that it requires these privileges?
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION4">
+        Make sure that these privileges make sense for what you think the extension needs to do. If they do not, click Cancel.
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_EXPLANATION5">
+        Do you trust this extension to perform these actions?
+      </message>
+
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_TRUST" desc="Text for the install button on the extension install prompt (for experiment group 1)">
+        Yes, I trust this extension!
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_YES" desc="Text for the install button on the extension install prompt (for experiment group 2)">
+        Yes, install
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_SURE" desc="Text for the install button on the extension install prompt (for experiment group 3)">
+        Yes, I'm sure
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_TRUST2" desc="Text for the install button on the extension install prompt (for experiment group 4)">
+        Yes, I trust it
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_INSTALL_BUTTON_NOPE" desc="Text for the cancel button on the extension install prompt">
+        Nope, cancel
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_SHOW_DETAILS" desc="The label of the button which displays permission info when clicked">
+        Show details
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_SHOW_PERMISSIONS" desc="The label of the button which displays permission list when clicked">
+        Show permissions
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_EXPERIMENT_CHECKBOX_INFO" desc="Text for the label that explains that user should check all checkboxes to process for installation.">
+        Please check all boxes to proceed.
+      </message>
+
+      <message name="IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS_EXPLANATION" desc="Extra explanation text for full access permission">
+        This extension can read and change all data on your computer and all websites including Google, Facebook, Yahoo, etc.
+      </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_ALL_HOSTS_EXPLANATION" desc="Extra explanation text for all sites permission">
+        This extension can read and change your information on all websites including Google, Facebook, Yahoo, etc.
+      </message>
 
       <!-- chrome://extension-info bubble -->
       <message name="IDS_EXTENSION_SCRIPT_POPUP_IS_RUNNING" desc="The label in the extension info bubble that indicates the extension is running scripts on this page">

chrome/browser/extensions/extension_install_prompt.cc

@@ -312,6 +312,11 @@ int ExtensionInstallPrompt::Prompt::GetDialogButtons() const {
   return kButtons[type_];
 }
 
+bool ExtensionInstallPrompt::Prompt::ShouldShowExplanationText() const {
+   return type_ == INSTALL_PROMPT &&
+       extension_->is_extension() && experiment_ && experiment_->text_only();
+}
+
 bool ExtensionInstallPrompt::Prompt::HasAcceptButtonLabel() const {
   if (kAcceptButtonIds[type_] == 0)
     return false;
@@ -333,15 +338,21 @@ base::string16 ExtensionInstallPrompt::Prompt::GetAcceptButtonLabel() const {
       id = IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_EXTENSION;
     return l10n_util::GetStringUTF16(id);
   }
+  if (ShouldShowExplanationText())
+    return experiment_->GetOkButtonText();
   return l10n_util::GetStringUTF16(kAcceptButtonIds[type_]);
 }
 
 bool ExtensionInstallPrompt::Prompt::HasAbortButtonLabel() const {
+  if (ShouldShowExplanationText())
+    return true;
   return kAbortButtonIds[type_] > 0;
 }
 
 base::string16 ExtensionInstallPrompt::Prompt::GetAbortButtonLabel() const {
   CHECK(HasAbortButtonLabel());
+  if (ShouldShowExplanationText())
+    return experiment_->GetCancelButtonText();
   return l10n_util::GetStringUTF16(kAbortButtonIds[type_]);
 }
 
@@ -785,6 +796,11 @@ void ExtensionInstallPrompt::OnMintTokenFailure(
 }
 
 void ExtensionInstallPrompt::ShowConfirmation() {
+  if (prompt_.type() == INSTALL_PROMPT)
+    prompt_.set_experiment(ExtensionInstallPromptExperiment::Find());
+  else
+    prompt_.set_experiment(ExtensionInstallPromptExperiment::ControlGroup());
+
   if (permissions_.get() &&
       (!extension_ ||
        !extensions::PermissionsData::ShouldSkipPermissionWarnings(

chrome/browser/extensions/extension_install_prompt.h

@@ -14,6 +14,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/extensions/crx_installer_error.h"
+#include "chrome/browser/extensions/extension_install_prompt_experiment.h"
 #include "extensions/common/url_pattern.h"
 #include "google_apis/gaia/oauth2_mint_token_flow.h"
 #include "google_apis/gaia/oauth2_token_service.h"
@@ -51,6 +52,8 @@ class ExtensionInstallPrompt
       public OAuth2TokenService::Consumer,
       public base::SupportsWeakPtr<ExtensionInstallPrompt> {
  public:
+  // This enum is associated with Extensions.InstallPrompt_Type UMA histogram.
+  // Do not modify existing values and add new values only to the end.
   enum PromptType {
     UNSET_PROMPT_TYPE = -1,
     INSTALL_PROMPT = 0,
@@ -109,6 +112,7 @@ class ExtensionInstallPrompt
     base::string16 GetRetainedFilesHeading() const;
 
     bool ShouldShowPermissions() const;
+    bool ShouldShowExplanationText() const;
 
     // Getters for webstore metadata. Only populated when the type is
     // INLINE_INSTALL_PROMPT.
@@ -151,6 +155,14 @@ class ExtensionInstallPrompt
     const gfx::Image& icon() const { return icon_; }
     void set_icon(const gfx::Image& icon) { icon_ = icon; }
 
+    const ExtensionInstallPromptExperiment* experiment() const {
+      return experiment_;
+    }
+
+    void set_experiment(ExtensionInstallPromptExperiment* experiment) {
+      experiment_ = experiment;
+    }
+
    private:
     bool ShouldDisplayRevokeFilesButton() const;
 
@@ -191,6 +203,8 @@ class ExtensionInstallPrompt
     bool show_user_count_;
 
     std::vector<base::FilePath> retained_files_;
+
+    scoped_refptr<ExtensionInstallPromptExperiment> experiment_;
   };
 
   static const int kMinExtensionRating = 0;