Android: Use virtualized context only for those with compatible config

ui/gl/gl_surface.h

Index: ui/gl/gl_surface.h
diff --git a/ui/gl/gl_surface.h b/ui/gl/gl_surface.h
index 3b08ebc8d57ce5057fd9af29844c6e9df56ab0cd..68bef153d5d557d1d00ccc778ef5f2e2c87d63f9 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -10,6 +10,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/sys_info.h"
 #include "build/build_config.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
@@ -38,8 +39,8 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
 
   // Minimum bit depth of surface.
   enum Format {
-    SURFACE_ARGB8888 = 1, // 32 bits
-    SURFACE_RGB565 = 2,  // 16 bits
+    SURFACE_ARGB8888,
+    SURFACE_RGB565,
     SURFACE_DEFAULT = SURFACE_ARGB8888
   };
 
@@ -152,7 +153,7 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   virtual void* GetConfig();
 
   // Get the GL pixel format of the surface, if available.
-  virtual unsigned GetFormat();
+  virtual GLSurface::Format GetFormat();
 
   // Get access to a helper providing time of recent refresh and period
   // of screen refresh. If unavailable, returns NULL.
@@ -209,10 +210,14 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
       gfx::AcceleratedWidget window);
 #endif  // defined(USE_OZONE)
 
+  static Format GetDefaultFormat() {
+    return base::SysInfo::IsLowEndDevice() ? SURFACE_RGB565 : SURFACE_ARGB8888;
+  }
+
   // Create a GL surface used for offscreen rendering.
   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
       const gfx::Size& size) {
-    return CreateOffscreenGLSurface(size, SURFACE_DEFAULT);
+    return CreateOffscreenGLSurface(size, GetDefaultFormat());
   }
 
   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
@@ -234,6 +239,8 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
 
   static bool ExtensionsContain(const char* extensions, const char* name);
 
+  GLSurface::Format format_;
+
  private:
   friend class base::RefCounted<GLSurface>;
   friend class GLContext;
@@ -279,7 +286,7 @@ class GL_EXPORT GLSurfaceAdapter : public GLSurface {
   void* GetShareHandle() override;
   void* GetDisplay() override;
   void* GetConfig() override;
-  unsigned GetFormat() override;
+  GLSurface::Format GetFormat() override;
   VSyncProvider* GetVSyncProvider() override;
   bool ScheduleOverlayPlane(int z_order,
                             OverlayTransform transform,