Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/extensions/extension_commands_global_registry.h

Index: chrome/browser/extensions/extension_commands_global_registry.h
diff --git a/chrome/browser/extensions/extension_commands_global_registry.h b/chrome/browser/extensions/extension_commands_global_registry.h
index 92a7a8e42b4073ab50a7802fea22dc99b01f798e..61e9af2920f816ac0e3ff362f0182db2b5c30530 100644
--- a/chrome/browser/extensions/extension_commands_global_registry.h
+++ b/chrome/browser/extensions/extension_commands_global_registry.h
@@ -33,6 +33,12 @@ class ExtensionCommandsGlobalRegistry
       public ExtensionKeybindingRegistry,
       public GlobalShortcutListener::Observer {
  public:
+  ExtensionKeybindingRegistry* active_registry() { return active_registry_; }
+
+  void set_active_registry(ExtensionKeybindingRegistry* registry) {
+    active_registry_ = registry;
+  }
+
   // BrowserContextKeyedAPI implementation.
   static BrowserContextKeyedAPIFactory<ExtensionCommandsGlobalRegistry>*
       GetFactoryInstance();
@@ -70,6 +76,9 @@ class ExtensionCommandsGlobalRegistry
   // Weak pointer to our browser context. Not owned by us.
   content::BrowserContext* browser_context_;
 
+  // The active ExtensionKeybindingRegistry.

[Devlin, 2014/09/12 00:10:33]

I might be a bit more specific here and say something like "The
ExtensionKeybindingRegistry that belongs to the active window. Only valid if
using TOOLKIT_VIEWS."

Whether or not we should #ifdef this code out for non-toolkit code... I don't
mind it being here (since it will be NULL otherwise, which is a logical value),
but I'll leave it to Finnur.

[David Tseng, 2014/09/12 01:26:58]

Done (the comment part).

[Finnur, 2014/09/12 11:25:44]

Rather than if-def'ing I'm actually more interested in getting this to work on
other platforms, as I think this is useful going forward. But that's probably
beyond the scope of this.

+  ExtensionKeybindingRegistry* active_registry_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionCommandsGlobalRegistry);
 };