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 1123974df7b63597f042420cbbd1bdb681a89175..c5892428ade30f1815b064bdf7bc38fca2e93901 100644
--- a/content/browser/media/media_web_contents_observer.cc
+++ b/content/browser/media/media_web_contents_observer.cc
@@ -14,6 +14,7 @@
 #include "content/common/media/media_player_delegate_messages.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
+#include "media/base/bind_to_current_loop.h"
 #include "ipc/ipc_message_macros.h"
 
 namespace content {
@@ -87,13 +88,40 @@ void MediaWebContentsObserver::WasHidden() {
     video_power_save_blocker_.reset();
 }
 
+// static
+void MediaWebContentsObserver::WaitForAudioFocusAsync(
+    int render_process_id,
+    int render_frame_id,
+    const base::Closure& focus_cb) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&MediaWebContentsObserver::WaitForAudioFocusAsync,
+                   render_process_id, render_frame_id,
+                   media::BindToCurrentLoop(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->WaitForAudioFocusAsyncInternal(render_frame_id, focus_cb);
+}
+
+void MediaWebContentsObserver::WaitForAudioFocusAsyncInternal(
+    int render_frame_id,
+    const base::Closure& focus_cb) {
+  NOTIMPLEMENTED();
+}
+
 void MediaWebContentsObserver::OnMediaDestroyed(
     RenderFrameHost* render_frame_host,
     int delegate_id) {
   OnMediaPaused(render_frame_host, delegate_id, true);
 }
 
-
 void MediaWebContentsObserver::OnMediaPaused(RenderFrameHost* render_frame_host,
                                              int delegate_id,
                                              bool reached_end_of_stream) {