Android WebView Merged-Thread Hardware Draw

android_webview/browser/renderer_host/aw_render_view_host_ext.cc

 // Copyright (c) 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 "android_webview/browser/renderer_host/aw_render_view_host_ext.h"
 
 #include "android_webview/browser/aw_browser_context.h"
 #include "android_webview/browser/scoped_allow_wait_for_legacy_web_view_api.h"
+#include "android_webview/common/aw_switches.h"
 #include "android_webview/common/render_view_messages.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
+#include "base/command_line.h"
 #include "base/logging.h"
+#include "content/public/browser/android/content_view_core.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/frame_navigate_params.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebCompositorInputHandler.h"
 
 namespace android_webview {
 
 AwRenderViewHostExt::AwRenderViewHostExt(content::WebContents* contents)
     : content::WebContentsObserver(contents),
       has_new_hit_test_data_(false) {
 }
 
 AwRenderViewHostExt::~AwRenderViewHostExt() {}
 
@@ skipping 70 matching lines @@
       ->AddVisitedURLs(params.redirects);
 }
 
 bool AwRenderViewHostExt::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AwRenderViewHostExt, message)
     IPC_MESSAGE_HANDLER(AwViewHostMsg_DocumentHasImagesResponse,
                         OnDocumentHasImagesResponse)
     IPC_MESSAGE_HANDLER(AwViewHostMsg_UpdateHitTestData,
                         OnUpdateHitTestData)
+    IPC_MESSAGE_HANDLER(AwViewHostMsg_DidActivateAcceleratedCompositing,
+                        OnDidActivateAcceleratedCompositing)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled ? true : WebContentsObserver::OnMessageReceived(message);
 }
 
 void AwRenderViewHostExt::OnDocumentHasImagesResponse(int msg_id,
                                                       bool has_images) {
   DCHECK(CalledOnValidThread());
   std::map<int, DocumentHasImagesResult>::iterator pending_req =
       pending_document_has_images_requests_.find(msg_id);
   if (pending_req == pending_document_has_images_requests_.end()) {
     DLOG(WARNING) << "unexpected DocumentHasImages Response: " << msg_id;
   } else {
     pending_req->second.Run(has_images);
     pending_document_has_images_requests_.erase(pending_req);
   }
 }
 
 void AwRenderViewHostExt::OnUpdateHitTestData(
     const AwHitTestData& hit_test_data) {
   DCHECK(CalledOnValidThread());
   last_hit_test_data_ = hit_test_data;
   has_new_hit_test_data_ = true;
 }
 
+void AwRenderViewHostExt::OnDidActivateAcceleratedCompositing(
+    int input_handler_id) {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kNoMergeUIAndRendererCompositorThreads)) {
+    return;
+  }
+
+  // This call is only meaningful and thread-safe when the UI and renderer
+  // compositor share the same thread.  Any other case will likely yield
+  // terrible, terrible damage.
+  WebKit::WebCompositorInputHandler* input_handler =
+      WebKit::WebCompositorInputHandler::fromIdentifier(input_handler_id);
+  if (!input_handler)
+    return;
+
+  content::ContentViewCore* content_view_core
+      = content::ContentViewCore::FromWebContents(web_contents());
+  if (content_view_core)
+    content_view_core->SetInputHandler(input_handler);
+}
+
 }  // namespace android_webview