Add RGB565 Texture readback support in gl_helper

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index d18a00898b57a8517e13a3b4d8616d42c97a15c8..9bf76235cd8d63d88132ce021b1b21593d242cf7 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1056,7 +1056,8 @@ BackingStore* RenderWidgetHostViewAura::AllocBackingStore(
 void RenderWidgetHostViewAura::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
-    const base::Callback<void(bool, const SkBitmap&)>& callback) {
+    const base::Callback<void(bool, const SkBitmap&)>& callback,
+    bool readback_config_rgb565) {
   if (!CanCopyToBitmap()) {
     callback.Run(false, SkBitmap());
     return;
@@ -1817,7 +1818,9 @@ void RenderWidgetHostViewAura::CopyFromCompositingSurfaceHasResult(
   }
 
   if (result->HasTexture()) {
-    PrepareTextureCopyOutputResult(dst_size_in_pixel, callback, result.Pass());
+    PrepareTextureCopyOutputResult(dst_size_in_pixel, false,
+                                   callback,
+                                   result.Pass());
     return;
   }
 
@@ -1839,6 +1842,7 @@ static void CopyFromCompositingSurfaceFinished(
 // static
 void RenderWidgetHostViewAura::PrepareTextureCopyOutputResult(
     const gfx::Size& dst_size_in_pixel,
+    bool readback_config_rgb565,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     scoped_ptr<cc::CopyOutputResult> result) {
   base::ScopedClosureRunner scoped_callback_runner(
@@ -1879,6 +1883,7 @@ void RenderWidgetHostViewAura::PrepareTextureCopyOutputResult(
       result->size(),
       gfx::Rect(result->size()),
       dst_size_in_pixel,
+      readback_config_rgb565,
       pixels,
       base::Bind(&CopyFromCompositingSurfaceFinished,
                  callback,