Defer media playback in background tabs.

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index bafd24fd348e738ca8c654a3e0f710a6e820597c..290217d2c171a1739062c42156812015a8b41e16 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -106,6 +106,7 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
                                  std::string* error_html,
                                  base::string16* error_description) override;
   void DeferMediaLoad(content::RenderFrame* render_frame,
+                      bool has_played_media_before,
                       const base::Closure& closure) override;
   bool RunIdleHandlerWhenWidgetsHidden() override;
   bool AllowPopup() override;