Forward handling of low-mem message to the content renderer client. Add APIs to handle this case.

content/renderer/render_thread.cc

Index: content/renderer/render_thread.cc
diff --git a/content/renderer/render_thread.cc b/content/renderer/render_thread.cc
index 81caa2d8d084a98ab7b95d1c93d250a76718779e..c482c9ee84592d90a2afec2a8835bc15157eabab 100644
--- a/content/renderer/render_thread.cc
+++ b/content/renderer/render_thread.cc
@@ -21,12 +21,16 @@
 #include "base/task.h"
 #include "base/threading/thread_local.h"
 #include "base/values.h"
+#include "chrome/common/render_messages.h"

[jam, 2011/07/21 16:35:27]

also, code in content can't include code in chrome,so you'll get a deps failure
for this. this is sent from chrome code, so it shouldn't be dispatched in
content.

[Greg Billock, 2011/07/21 19:10:01]

Is there a lint or presubmit to run that detects this? It compiles ok, but
presumably there's another tool that will holler.

On 2011/07/21 16:35:27, John Abd-El-Malek wrote:

[jam, 2011/07/22 16:31:50]

there's tools\checkdeps\checkdeps.py. We don't run it on presubmit because it's
slow, but it runs on the trybots

[Greg Billock, 2011/07/22 17:02:07]

cool. I did see the check_deps fail on the trybots.

On 2011/07/22 16:31:50, John Abd-El-Malek wrote:

 #include "content/common/appcache/appcache_dispatcher.h"
+#include "content/common/content_notification_types.h"
 #include "content/common/content_switches.h"
 #include "content/common/database_messages.h"
 #include "content/common/db_message_filter.h"
 #include "content/common/dom_storage_messages.h"
 #include "content/common/gpu/gpu_messages.h"
+#include "content/common/notification_service.h"
+#include "content/common/notification_source.h"
 #include "content/common/plugin_messages.h"
 #include "content/common/renderer_preferences.h"
 #include "content/common/resource_messages.h"
@@ -411,6 +415,7 @@ bool RenderThread::OnControlMessageReceived(const IPC::Message& msg) {
     // TODO(port): removed from render_messages_internal.h;
     // is there a new non-windows message I should add here?
     IPC_MESSAGE_HANDLER(ViewMsg_New, OnCreateNewView)
+    IPC_MESSAGE_HANDLER(ViewMsg_PurgeMemory, OnPurgeMemory)
     IPC_MESSAGE_HANDLER(ViewMsg_PurgePluginListCache, OnPurgePluginListCache)
     IPC_MESSAGE_HANDLER(ViewMsg_NetworkStateChanged, OnNetworkStateChanged)
     IPC_MESSAGE_HANDLER(DOMStorageMsg_Event, OnDOMStorageEvent)
@@ -677,6 +682,13 @@ void RenderThread::ScheduleIdleHandler(double initial_delay_s) {
       this, &RenderThread::IdleHandler);
 }
 
+void RenderThread::OnPurgeMemory() {
+  NotificationService::current()->Notify(
+      content::NOTIFICATION_PURGE_MEMORY,
+      Source<void>(NULL),
+      NotificationService::NoDetails());
+}
+
 void RenderThread::OnPurgePluginListCache(bool reload_pages) {
   EnsureWebKitInitialized();
   // The call below will cause a GetPlugins call with refresh=true, but at this