cc: Adding support for RGBA_4444 tile textures

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 9c7f355799649028f47fb238aa5af563adacc58e..46a0c0e3f2e2e4c3d757805e017c9064b8316bad 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -136,7 +136,7 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
                  opaque_rect,
                  texture_rect,
                  texture_size,
-                 false,
+                 RGBA_8888,
                  quad_content_rect,
                  contents_scale,
                  draw_direct_to_backbuffer,
@@ -248,17 +248,17 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
         gfx::Rect opaque_rect = iter->opaque_rect();
         opaque_rect.Intersect(content_rect);
 
+        ResourceProvider* resource_provider =
+            layer_tree_impl()->resource_provider();
+        ResourceFormat format =
+            resource_provider->memory_efficient_texture_format();
         scoped_ptr<PictureDrawQuad> quad = PictureDrawQuad::Create();
         quad->SetNew(shared_quad_state,
                      geometry_rect,
                      opaque_rect,
                      texture_rect,
                      iter.texture_size(),
-                     // TODO(reveman): This assumes the renderer will use
-                     // GL_RGBA as format of temporary resource. The need
-                     // to swizzle should instead be determined by the
-                     // renderer.
-                     !PlatformColor::SameComponentOrder(GL_RGBA),
+                     format,
                      iter->content_rect(),
                      iter->contents_scale(),
                      draw_direct_to_backbuffer,