[Android] Add gtest implementation documentation.

testing/android/docs/index.md

Index: testing/android/docs/index.md
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-# Android Testing in Chromium
-
-## How do I...
-
-  - **set up**
-    - [... set up a device for local testing?](/testing/android/docs/todo.md)
-    - [... set up an emulator for local testing?](/testing/android/docs/todo.md)
-  - **writing tests**
-    - [... write an instrumentation test?](/testing/android/docs/instrumentation.md)
-    - [... write a Robolectric test?](/testing/android/docs/todo.md)
-  - **running tests**
-    - [... run a gtest?](/testing/android/docs/todo.md)
-    - [... run an instrumentation test?](/testing/android/docs/todo.md)
-    - [... run a Robolectric test?](/testing/android/docs/todo.md)
-    - [... run the blink layout tests?](https://sites.google.com/a/chromium.org/dev/developers/testing/webkit-layout-tests)
-    - [... run a telemetry test?](/testing/android/docs/todo.md)
-  - **miscellaneous**
-    - [... use code coverage for Java tests?](/build/android/docs/coverage.md)
-
-## How does it work on Android?
-
-  - [c++ browser tests](/testing/android/docs/todo.md)
-  - [c++ unit tests](/testing/android/docs/todo.md)
-  - [instrumentation tests](/testing/android/docs/todo.md)
-  - [junit tests](/testing/android/docs/todo.md)