Adds support for hittesting points on surface quads

content/browser/compositor/delegated_frame_host.cc

 // Copyright 2014 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 "content/browser/compositor/delegated_frame_host.h"
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/time/default_tick_clock.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/resources/single_release_callback.h"
 #include "cc/resources/texture_mailbox.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_factory.h"
+#include "cc/surfaces/surface_hittest.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/resize_lock.h"
+#include "content/browser/compositor/surface_utils.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/common/gpu/client/gl_helper.h"
 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
 #include "content/public/common/content_switches.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/effects/SkLumaColorFilter.h"
@@ skipping 167 matching lines @@
   frame_subscriber_.reset();
 }
 
 uint32_t DelegatedFrameHost::GetSurfaceIdNamespace() {
   if (!use_surfaces_)
     return 0;
 
   return id_allocator_->id_namespace();
 }
 
+cc::SurfaceId DelegatedFrameHost::SurfaceIdAtPoint(const gfx::Point& point) {
+  cc::SurfaceHittest hittest(GetSurfaceManager());
+  return hittest.Hittest(surface_id_, point);
+}
+
 bool DelegatedFrameHost::ShouldSkipFrame(gfx::Size size_in_dip) const {
   // Should skip a frame only when another frame from the renderer is guaranteed
   // to replace it. Otherwise may cause hangs when the renderer is waiting for
   // the completion of latency infos (such as when taking a Snapshot.)
   if (can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
       can_lock_compositor_ == NO_PENDING_COMMIT ||
       !resize_lock_.get())
     return false;
 
   return size_in_dip != resize_lock_->expected_size();
@@ skipping 804 matching lines @@
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     new_layer->SetShowSurface(
         surface_id_, base::Bind(&SatisfyCallback, base::Unretained(manager)),
         base::Bind(&RequireCallback, base::Unretained(manager)),
         current_surface_size_, current_scale_factor_,
         current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content