Plumb audio focus support for spitzer clients.

content/browser/media/media_web_contents_observer.cc

Index: content/browser/media/media_web_contents_observer.cc
diff --git a/content/browser/media/media_web_contents_observer.cc b/content/browser/media/media_web_contents_observer.cc
index e4f16d8223c320484f3f653fe3366c7c8bcd6c2f..426550234db65bbc3342020be0b0f6f52ef09ff1 100644
--- a/content/browser/media/media_web_contents_observer.cc
+++ b/content/browser/media/media_web_contents_observer.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/media/media_web_contents_observer.h"
 
+#include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "content/browser/power_save_blocker_impl.h"
@@ -12,6 +13,7 @@
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "ipc/ipc_message_macros.h"
+#include "media/base/bind_to_current_loop.h"
 
 namespace content {
 
@@ -65,6 +67,33 @@ void MediaWebContentsObserver::WasHidden() {
     video_power_save_blocker_.reset();
 }
 
+// static
+void MediaWebContentsObserver::HasAudioFocus(int render_process_id,
+                                             int render_frame_id,
+                                             const base::Closure& on_focus_cb) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&MediaWebContentsObserver::HasAudioFocus, render_process_id,
+                   render_frame_id, media::BindToCurrentLoop(on_focus_cb)));
+    return;
+  }
+
+  WebContents* web_contents = WebContents::FromRenderFrameHost(
+      RenderFrameHost::FromID(render_process_id, render_frame_id));
+  if (!web_contents)
+    return;
+
+  MediaWebContentsObserver* p_this = static_cast<WebContentsImpl*>(web_contents)
+                                         ->media_web_contents_observer();
+  p_this->CheckFocus(render_frame_id, on_focus_cb);
+}
+
+void MediaWebContentsObserver::CheckFocus(int render_frame_id,
+                                          const base::Closure& on_focus_cb) {
+  NOTIMPLEMENTED();
+}
+
 void MediaWebContentsObserver::OnMediaDestroyedNotification(
     RenderFrameHost* render_frame_host,
     int64_t player_cookie) {