Add Bluetooth class diagram documentation references to README files.

Adjust content/README to markdown to enable linking.
Create new README.md files for content and WebKit bluetooth directories.

Review URL: https://codereview.chromium.org/1647013002

Cr-Commit-Position: refs/heads/master@{#372390}

content/README → content/README.md

@@ -4,3 +4,8 @@ browser.
 Developer documentation:
 http://www.chromium.org/developers/content-module
 
+Internal Documentation:
+
+* [Bluetooth](browser/bluetooth/README.md)
+
+

content/browser/bluetooth/README.md

@@ -0,0 +1,24 @@
+Bluetooth in Content
+====================
+
+`content/*/bluetooth` implements [Web Bluetooth][WB] using the
+`device/bluetooth` code module.
+
+[WB]: https://webbluetoothcg.github.io/web-bluetooth/
+
+Testing
+--------------------------------------------------------------------------------
+
+Bluetooth layout tests in `third_party/WebKit/LayoutTests/bluetooth/` rely on
+fake Bluetooth implementation classes constructed in
+`content/shell/browser/layout_test/layout_test_bluetooth_adapter_provider`.
+These tests span JavaScript binding to the `device/bluetooth` API layer.
+
+
+Design Documents
+--------------------------------------------------------------------------------
+
+See: [Class Diagram of Web Bluetooth through Bluetooth Android][Class]
+
+[Class]: https://sites.google.com/a/chromium.org/dev/developers/design-documents/bluetooth-design-docs/web-bluetooth-through-bluetooth-android-class-diagram
+

device/bluetooth/README.md

@@ -124,3 +124,8 @@ Thus:
             * ... and so on for characteristics and descriptors.
 
 Fake objects are controlled by `bluetooth_test_android.cc`.
+
+See also: [Class Diagram of Web Bluetooth through Bluetooth Android][Class]
+
+[Class]: https://sites.google.com/a/chromium.org/dev/developers/design-documents/bluetooth-design-docs/web-bluetooth-through-bluetooth-android-class-diagram
+

third_party/WebKit/Source/modules/bluetooth/README.md

@@ -0,0 +1,23 @@
+Web Bluetooth
+=============
+
+`Source/modules/bluetooth` implements [Web Bluetooth][WB].
+
+[WB]: https://webbluetoothcg.github.io/web-bluetooth/
+
+Testing
+--------------------------------------------------------------------------------
+
+Bluetooth layout tests in `LayoutTests/bluetooth/` rely on
+fake Bluetooth implementation classes constructed in
+`content/shell/browser/layout_test/layout_test_bluetooth_adapter_provider`.
+These tests span JavaScript binding to the `device/bluetooth` API layer.
+
+
+Design Documents
+--------------------------------------------------------------------------------
+
+See: [Class Diagram of Web Bluetooth through Bluetooth Android][Class]
+
+[Class]: https://sites.google.com/a/chromium.org/dev/developers/design-documents/bluetooth-design-docs/web-bluetooth-through-bluetooth-android-class-diagram
+