Plugin Power Saver: Implement size-based heuristic for peripheral content.

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 17739522f077294634cf8a8375b5fc6afe2aca48..4078fa823837748189379ddf271702b17c25c420 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -490,6 +490,12 @@ IPC_MESSAGE_ROUTED4(FrameMsg_CommitNavigation,
                     content::CommonNavigationParams, /* common_params */
                     content::CommitNavigationParams /* commit_params */)
 
+#if defined(ENABLE_PLUGINS)
+// Notifies the renderer of updates to the Plugin Power Saver origin whitelist.
+IPC_MESSAGE_ROUTED1(FrameMsg_UpdatePluginContentOriginWhitelist,
+                    std::set<GURL> /* origin_whitelist */)
+#endif  // defined(ENABLE_PLUGINS)
+
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.
 
@@ -601,6 +607,7 @@ IPC_MESSAGE_ROUTED2(FrameHostMsg_DomOperationResponse,
                     std::string  /* json_string */,
                     int  /* automation_id */)
 
+#if defined(ENABLE_PLUGINS)
 // Sent to the browser when the renderer detects it is blocked on a pepper
 // plugin message for too long. This is also sent when it becomes unhung
 // (according to the value of is_hung). The browser can give the user the
@@ -644,6 +651,14 @@ IPC_SYNC_MESSAGE_CONTROL4_2(FrameHostMsg_OpenChannelToPlugin,
                             IPC::ChannelHandle /* channel_handle */,
                             content::WebPluginInfo /* info */)
 
+// A renderer sends this to the browser process when it wants to temporarily
+// whitelist an origin's plugin content as essential. This temporary whitelist
+// is specific to a top level frame, and is cleared when the whitelisting
+// RenderFrame is destroyed.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_PluginContentOriginAllowed,
+                    GURL /* content_origin */)
+#endif  // defined(ENABLE_PLUGINS)
+
 // Acknowledge that we presented an ubercomp frame.
 //
 // See FrameMsg_CompositorFrameSwapped