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 dddc7b639b5c44ba404c6cb11d634b56bdd9bbf5..4a5646171cab769ab759a97b3fbde18b579a5841 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1810,7 +1810,9 @@ void RenderWidgetHostViewAura::CopyFromCompositingSurfaceHasResult(
   }
 
   if (result->HasTexture()) {
-    PrepareTextureCopyOutputResult(dst_size_in_pixel, callback, result.Pass());
+    PrepareTextureCopyOutputResult(dst_size_in_pixel, false,
+                                   callback,
+                                   result.Pass());
     return;
   }
 
@@ -1832,6 +1834,7 @@ 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(
@@ -1872,6 +1875,7 @@ void RenderWidgetHostViewAura::PrepareTextureCopyOutputResult(
       result->size(),
       gfx::Rect(result->size()),
       dst_size_in_pixel,
+      readback_config_rgb565,
       pixels,
       base::Bind(&CopyFromCompositingSurfaceFinished,
                  callback,