Revert of Remove blink::WebLayerClient and WebGraphicsLayerDebugInfo.

cc/blink/web_layer_impl.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 "cc/blink/web_layer_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_checker.h"
 #include "base/trace_event/trace_event_impl.h"
 #include "cc/animation/animation.h"
 #include "cc/base/region.h"
 #include "cc/base/switches.h"
 #include "cc/blink/web_animation_impl.h"
 #include "cc/blink/web_blend_mode.h"
 #include "cc/blink/web_filter_operations_impl.h"
 #include "cc/blink/web_to_cc_animation_delegate_adapter.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_position_constraint.h"
 #include "cc/layers/layer_settings.h"
 #include "cc/trees/layer_tree_host.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
 #include "third_party/WebKit/public/platform/WebFloatRect.h"
+#include "third_party/WebKit/public/platform/WebGraphicsLayerDebugInfo.h"
+#include "third_party/WebKit/public/platform/WebLayerClient.h"
 #include "third_party/WebKit/public/platform/WebLayerPositionConstraint.h"
 #include "third_party/WebKit/public/platform/WebLayerScrollClient.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/skia/include/utils/SkMatrix44.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
 
 using cc::Animation;
 using cc::Layer;
 using blink::WebLayer;
 using blink::WebFloatPoint;
 using blink::WebVector;
 using blink::WebRect;
 using blink::WebSize;
 using blink::WebColor;
 using blink::WebFilterOperations;
 
 namespace cc_blink {
 namespace {
 
 base::LazyInstance<cc::LayerSettings> g_layer_settings =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 WebLayerImpl::WebLayerImpl()
     : layer_(Layer::Create(LayerSettings())), contents_opaque_is_fixed_(false) {
+  web_layer_client_ = nullptr;
+  layer_->SetLayerClient(this);
 }
 
 WebLayerImpl::WebLayerImpl(scoped_refptr<Layer> layer)
     : layer_(layer), contents_opaque_is_fixed_(false) {
+  web_layer_client_ = nullptr;
+  layer_->SetLayerClient(this);
 }
 
 WebLayerImpl::~WebLayerImpl() {
   if (animation_delegate_adapter_.get())
     layer_->set_layer_animation_delegate(nullptr);
+  web_layer_client_ = nullptr;
   layer_->SetLayerClient(nullptr);
 }
 
 // static
 void WebLayerImpl::SetLayerSettings(const cc::LayerSettings& settings) {
   g_layer_settings.Get() = settings;
 }
 
 // static
 const cc::LayerSettings& WebLayerImpl::LayerSettings() {
@@ skipping 405 matching lines @@
                    base::Unretained(scroll_client)));
   } else {
     layer_->set_did_scroll_callback(base::Closure());
   }
 }
 
 bool WebLayerImpl::isOrphan() const {
   return !layer_->layer_tree_host();
 }
 
-void WebLayerImpl::setLayerClient(cc::LayerClient* client) {
-  layer_->SetLayerClient(client);
+void WebLayerImpl::setWebLayerClient(blink::WebLayerClient* client) {
+  web_layer_client_ = client;
 }
 
-const cc::Layer* WebLayerImpl::ccLayer() const {
-  return layer_.get();
+class TracedDebugInfo : public base::trace_event::ConvertableToTraceFormat {
+ public:
+  // This object takes ownership of the debug_info object.
+  explicit TracedDebugInfo(blink::WebGraphicsLayerDebugInfo* debug_info)
+      : debug_info_(debug_info) {}
+  void AppendAsTraceFormat(std::string* out) const override {
+    DCHECK(thread_checker_.CalledOnValidThread());
+    blink::WebString web_string;
+    debug_info_->appendAsTraceFormat(&web_string);
+    out->append(web_string.utf8());
+  }
+
+ private:
+  ~TracedDebugInfo() override {}
+  scoped_ptr<blink::WebGraphicsLayerDebugInfo> debug_info_;
+  base::ThreadChecker thread_checker_;
+};
+
+scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+WebLayerImpl::TakeDebugInfo() {
+  if (!web_layer_client_)
+    return nullptr;
+  blink::WebGraphicsLayerDebugInfo* debug_info =
+      web_layer_client_->takeDebugInfoFor(this);
+
+  if (debug_info)
+    return new TracedDebugInfo(debug_info);
+  else
+    return nullptr;
 }
 
 void WebLayerImpl::setScrollParent(blink::WebLayer* parent) {
   cc::Layer* scroll_parent = nullptr;
   if (parent)
     scroll_parent = static_cast<WebLayerImpl*>(parent)->layer();
   layer_->SetScrollParent(scroll_parent);
 }
 
 void WebLayerImpl::setClipParent(blink::WebLayer* parent) {
   cc::Layer* clip_parent = nullptr;
   if (parent)
     clip_parent = static_cast<WebLayerImpl*>(parent)->layer();
   layer_->SetClipParent(clip_parent);
 }
 
 Layer* WebLayerImpl::layer() const {
   return layer_.get();
 }
 
 void WebLayerImpl::SetContentsOpaqueIsFixed(bool fixed) {
   contents_opaque_is_fixed_ = fixed;
 }
 
 }  // namespace cc_blink