WebView: avoid library name clash when building standalone.

The standalone libwebviewchromium.so "clashes" with the one built using
android_webview_build==1; rename it in the standalone case so that if
you end up with both available, the correct one is used.

product_prefix is used because this ensures that the existing logic to
use product_extension to make component builds work is not disrupted.
Tested change with component and non-component builds.

BUG=

Review URL: https://codereview.chromium.org/37373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230485 0039d316-1c4b-4281-b951-d872f2087c98

android_webview/android_webview.gyp

@@ -17,6 +17,11 @@
         'android_webview_common',
       ],
       'conditions': [
+        # Avoid clashes between the versions of this library built with
+        # android_webview_build==1 by using a different name prefix.
+        [ 'android_webview_build==0', {
+          'product_prefix': 'libstandalone',
+        }],
         # The general approach is to allow the executable target to choose
         # the allocator, but as in the WebView case we are building a library
         # only, put the dependency on the allocator here

android_webview/android_webview_tests.gypi

@@ -14,7 +14,7 @@
       'variables': {
         'apk_name': 'AndroidWebView',
         'java_in_dir': 'test/shell',
-        'native_lib_target': 'libwebviewchromium',
+        'native_lib_target': 'libstandalonelibwebviewchromium',
         'resource_dir': 'test/shell/res',
         'additional_input_paths': [
           '<(PRODUCT_DIR)/android_webview_apk/assets/webviewchromium.pak',