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 1d251a87cb7087c74bcdd1e836b8844c963ccd8b..ec97fa85a409da98eaab8bee6a5fa34782b2f8e5 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1815,7 +1815,9 @@ void RenderWidgetHostViewAura::CopyFromCompositingSurfaceHasResult(
   }
 
   if (result->HasTexture()) {
-    PrepareTextureCopyOutputResult(dst_size_in_pixel, callback, result.Pass());
+    PrepareTextureCopyOutputResult(dst_size_in_pixel, false,
+                                   callback,
+                                   result.Pass());
     return;
   }
 
@@ -1837,6 +1839,7 @@ 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(
@@ -1877,6 +1880,7 @@ void RenderWidgetHostViewAura::PrepareTextureCopyOutputResult(
       result->size(),
       gfx::Rect(result->size()),
       dst_size_in_pixel,
+      readback_config_rgb565,
       pixels,
       base::Bind(&CopyFromCompositingSurfaceFinished,
                  callback,