cc: Apply occlusion before creating quads in TextureLayerImpl.

cc/layers/texture_layer_impl.cc

 // Copyright 2011 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/texture_layer_impl.h"
 
 #include <vector>
 
 #include "base/strings/stringprintf.h"
 #include "cc/layers/quad_sink.h"
@@ skipping 154 matching lines @@
   SharedQuadState* shared_quad_state =
       quad_sink->UseSharedQuadState(CreateSharedQuadState());
   AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
 
   SkColor bg_color = blend_background_color_ ?
       background_color() : SK_ColorTRANSPARENT;
   bool opaque = contents_opaque() || (SkColorGetA(bg_color) == 0xFF);
 
   gfx::Rect quad_rect(content_bounds());
   gfx::Rect opaque_rect = opaque ? quad_rect : gfx::Rect();
-  gfx::Rect visible_quad_rect(quad_rect);
+  gfx::Rect visible_quad_rect = quad_sink->UnoccludedContentRect(
+      quad_rect, draw_properties().target_space_transform);
+  if (visible_quad_rect.IsEmpty())
+    return;
+
   scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
   ResourceProvider::ResourceId id =
       valid_texture_copy_ ? texture_copy_->id() : external_texture_resource_;
   quad->SetNew(shared_quad_state,
                quad_rect,
                opaque_rect,
                visible_quad_rect,
                id,
                premultiplied_alpha_,
                uv_top_left_,
                uv_bottom_right_,
                bg_color,
                vertex_opacity_,
                flipped_);
-  quad_sink->MaybeAppend(quad.PassAs<DrawQuad>());
+  quad_sink->Append(quad.PassAs<DrawQuad>());
 }
 
 void TextureLayerImpl::DidDraw(ResourceProvider* resource_provider) {
   LayerImpl::DidDraw(resource_provider);
   if (uses_mailbox_ || !external_texture_resource_)
     return;
   // TODO(danakj): the following assert will not be true when sending resources
   // to a parent compositor. A synchronization scheme (double-buffering or
   // pipelining of updates) for the client will need to exist to solve this.
   DCHECK(!resource_provider->InUseByConsumer(external_texture_resource_));
@@ skipping 82 matching lines @@
   } else if (external_texture_resource_) {
     DCHECK(!own_mailbox_);
     ResourceProvider* resource_provider =
         layer_tree_impl()->resource_provider();
     resource_provider->DeleteResource(external_texture_resource_);
     external_texture_resource_ = 0;
   }
 }
 
 }  // namespace cc