Implement mix-blend-mode in GL renderer using shaders.

cc/layers/delegated_renderer_layer_impl_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/delegated_renderer_layer_impl.h"
 
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/layers/solid_color_layer_impl.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
@@ skipping 1398 matching lines @@
                                         pass2_id,
                                         gfx::Rect(quad_screen_rect.size()),
                                         transform);
   AddQuad(pass2, gfx::Rect(quad_screen_rect.size()), SK_ColorRED);
   // |pass1| covers the whole layer.
   RenderPassId pass1_id = RenderPassId(impl.root_layer()->id(), 0);
   TestRenderPass* pass1 = AddRenderPass(&delegated_render_passes,
                                         pass1_id,
                                         gfx::Rect(layer_size),
                                         gfx::Transform());
-  AddRenderPassQuad(pass1, pass2, 0, FilterOperations(), transform);
+  AddRenderPassQuad(pass1,
+                    pass2,
+                    0,
+                    FilterOperations(),
+                    transform,
+                    SkXfermode::kSrcOver_Mode);
   delegated_renderer_layer_impl->SetFrameDataForRenderPasses(
       1.f, &delegated_render_passes);
 
   impl.CalcDrawProps(viewport_size);
 
   {
     SCOPED_TRACE("No occlusion");
     gfx::Rect occluded;
 
     {
@@ skipping 137 matching lines @@
   scoped_ptr<DelegatedRendererLayerImpl> other_layer =
       DelegatedRendererLayerImpl::Create(host_impl_->active_tree(), 6);
 
   delegated_renderer_layer_impl->PushPropertiesTo(other_layer.get());
 
   EXPECT_EQ(0.5f, other_layer->inverse_device_scale_factor());
 }
 
 }  // namespace
 }  // namespace cc