Documentation update

Mostly mentioning other platforms where older documentation mentioned
only Windows.

Bug: angleproject:1944
Change-Id: Ib020892fbdee22d3dc60aa71ac6b3c5f504728c4
Reviewed-on: https://chromium-review.googlesource.com/c/1430559
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

OWNERS

@@ -1,6 +1,6 @@
 # See https://chromium.googlesource.com/angle/angle/+/master/doc/ContributingCode.md#selecting-reviewers for per-file owners
 cwallez@chromium.org
-fjhenigman@chromium.org
 geofflang@chromium.org
 jmadill@chromium.org
+syoussefi@chromium.org
 ynovikov@chromium.org

doc/DevSetup.md

@@ -1,6 +1,6 @@
 # ANGLE Development
 
-ANGLE provides OpenGL ES 2.0 and EGL 1.4 libraries and dlls.  You can use these to build and run OpenGL ES 2.0 applications on Windows.
+ANGLE provides OpenGL ES 2.0 and EGL 1.4 libraries and dlls.  You can use these to build and run OpenGL ES 2.0 applications on Windows, Linux, Mac and Android.
 
 ## Development setup
 
@@ -30,7 +30,7 @@ On Windows:
 
 On Linux:
 
- * Development packages for OpenGL, X11 and libpci (all of these dependencies should be installed automatically when running install-build-deps.sh later on).
+ * Development packages for OpenGL, X11 and libpci (all of these dependencies should be installed automatically when running `install-build-deps.sh` later on).
  * Bison and flex are not needed as we only support generating the translator grammar on Windows.
 
 On MacOS:
@@ -134,12 +134,13 @@ Also, follow [How to build ANGLE in Chromium for dev](BuildingAngleForChromiumDe
 ## Application Development with ANGLE
 This sections describes how to use ANGLE to build an OpenGL ES application.
 
-### Choosing a D3D Backend
-ANGLE can use either a backing renderer which uses D3D11 on systems where it is available, or a D3D9-only renderer.
+### Choosing a Backend
+ANGLE can use a variety of backing renderers based on platform.  On Windows, it defaults to D3D11 where it's available,
+or D3D9 otherwise.  On other desktop platforms, it defaults to GL.  On mobile, it defaults to GLES.
 
-ANGLE provides an EGL extension called `EGL_ANGLE_platform_angle` which allows uers to select which renderer to use at EGL initialization time by calling eglGetPlatformDisplayEXT with special enums. Details of the extension can be found in it's specification in `extensions/ANGLE_platform_angle.txt` and `extensions/ANGLE_platform_angle_d3d.txt` and examples of it's use can be seen in the ANGLE samples and tests, particularly `util/EGLWindow.cpp`.
+ANGLE provides an EGL extension called `EGL_ANGLE_platform_angle` which allows uers to select which renderer to use at EGL initialization time by calling eglGetPlatformDisplayEXT with special enums. Details of the extension can be found in it's specification in `extensions/ANGLE_platform_angle.txt` and `extensions/ANGLE_platform_angle_*.txt` and examples of it's use can be seen in the ANGLE samples and tests, particularly `util/EGLWindow.cpp`.
 
-By default, ANGLE will use a D3D11 renderer. To change the default:
+To change the default D3D backend:
 
  1. Open `src/libANGLE/renderer/d3d/DisplayD3D.cpp`
  2. Locate the definition of `ANGLE_DEFAULT_D3D11` near the head of the file, and set it to your preference.

doc/MANGLE.md

@@ -1,9 +1,9 @@
 # M(ulti-platform)ANGLE effort
 
 Starting in early 2014, the ANGLE team has begun work on refactoring the code
-with the goal of supporting translation to desktop OpenGL. The new purpose of
-ANGLE will be provide a consistent OpenGL ES and EGL context on as many
-platforms as possible.
+with the goal of supporting translation to desktop OpenGL. In 2016, work on
+supporting Vulkan as a back-end started. The new purpose of ANGLE is to
+provide a consistent OpenGL ES and EGL context on as many platforms as possible.
 
 The design doc is available [here]
 (https://docs.google.com/document/d/17mxRfzXuEWyvGM3t2KqVY4svvfRj_GzysOEpmnDpqeo/edit?usp=sharing).

doc/dEQP.md

@@ -36,10 +36,10 @@ If you're running a full test suite, it might take very long time. Running in
 Debug is only useful to isolate and fix particular failures, Release will give
 a better sense of total passing rate.
 
-### Choosing a Renderer on Windows
+### Choosing a Renderer
 
-By default Windows ANGLE tests with D3D11. To specify the exact platform for
-ANGLE + dEQP, use the arguments:
+By default ANGLE tests with D3D11 on Windows, GLES on mobile and Desktop GL otherwise.
+To specify the exact platform for ANGLE + dEQP, use the arguments:
 
   * `--deqp-egl-display-type=angle-d3d11` for D3D11 (highest available feature level)
   * `--deqp-egl-display-type=angle-d3d9` for D3D9
@@ -48,6 +48,8 @@ ANGLE + dEQP, use the arguments:
   * `--deqp-egl-display-type=angle-gles` for OpenGL ES (Android/ChromeOS, some Windows platforms)
   * `--deqp-egl-display-type=angle-vulkan` for Vulkan (Android, Linux, Windows)
 
+The flag `--use-angle=X` has the same effect as `--deqp-egl-display-type=angle-X`.
+
 ### Check your results
 
 If run from Visual Studio 2015, dEQP generates a test log to