Chromecast: add a CastRenderViewObserver for wiring up native bindings.

chromecast/renderer/cast_content_renderer_client.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 "chromecast/renderer/cast_content_renderer_client.h"
 
 #include <sys/sysinfo.h>
 
 #include "base/command_line.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "chromecast/common/chromecast_switches.h"
 #include "chromecast/renderer/cast_media_load_deferrer.h"
 #include "chromecast/renderer/cast_render_process_observer.h"
 #include "chromecast/renderer/key_systems_cast.h"
 #include "chromecast/renderer/media/cma_media_renderer_factory.h"
 #include "components/dns_prefetch/renderer/prescient_networking_dispatcher.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
+#include "content/public/renderer/render_view_observer.h"
 #include "crypto/nss_util.h"
 #include "third_party/WebKit/public/platform/WebColor.h"
 #include "third_party/WebKit/public/web/WebSettings.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 namespace chromecast {
 namespace shell {
 
 namespace {
 
@@ skipping 34 matching lines @@
       FROM_HERE,
       base::Bind(&PlatformPollFreemem),
       base::TimeDelta::FromMilliseconds(kPollingIntervalMS));
 }
 #endif
 
 // Default background color to set for WebViews. WebColor is in ARGB format
 // though the comment of WebColor says it is in RGBA.
 const blink::WebColor kColorBlack = 0xFF000000;
 
+class CastRenderViewObserver : content::RenderViewObserver {
+ public:
+  explicit CastRenderViewObserver(content::RenderView* render_view);
+  ~CastRenderViewObserver() override {}
+
+  void DidClearWindowObject(blink::WebLocalFrame* frame) override;
+};
+
+CastRenderViewObserver::CastRenderViewObserver(content::RenderView* render_view)
+    : content::RenderViewObserver(render_view) {
+}
+
+void CastRenderViewObserver::DidClearWindowObject(blink::WebLocalFrame* frame) {
+  // Native bindings go here.
+}
+
 }  // namespace
 
 CastContentRendererClient::CastContentRendererClient() {
 }
 
 CastContentRendererClient::~CastContentRendererClient() {
 }
 
 void CastContentRendererClient::RenderThreadStarted() {
 #if defined(USE_NSS)
@@ skipping 25 matching lines @@
 
     // The following settings express consistent behaviors across Cast
     // embedders, though Android has enabled by default for mobile browsers.
     webview->settings()->setShrinksViewportContentToFit(false);
     webview->settings()->setMediaControlsOverlayPlayButtonEnabled(false);
 
     // Disable application cache as Chromecast doesn't support off-line
     // application running.
     webview->settings()->setOfflineWebApplicationCacheEnabled(false);
   }
+
+  // Note: RenderView will own the lifetime of its observer.
+  new CastRenderViewObserver(render_view);
 }
 
 void CastContentRendererClient::AddKeySystems(
     std::vector< ::media::KeySystemInfo>* key_systems) {
   AddChromecastKeySystems(key_systems);
   AddChromecastPlatformKeySystems(key_systems);
 }
 
 #if !defined(OS_ANDROID)
 scoped_ptr<::media::RendererFactory>
@@ skipping 21 matching lines @@
     closure.Run();
     return;
   }
 
   // Lifetime is tied to |render_frame| via content::RenderFrameObserver.
   new CastMediaLoadDeferrer(render_frame, closure);
 }
 
 }  // namespace shell
 }  // namespace chromecast