Moved theme related state from BrowserInstantController to InstantService.

chrome/browser/ui/search/instant_controller.h

Index: chrome/browser/ui/search/instant_controller.h
diff --git a/chrome/browser/ui/search/instant_controller.h b/chrome/browser/ui/search/instant_controller.h
index cdb170bc55056603a11d19153bc4153811765d35..0caac6ea4044b749b340febec230c31aa14ec48f 100644
--- a/chrome/browser/ui/search/instant_controller.h
+++ b/chrome/browser/ui/search/instant_controller.h
@@ -16,6 +16,7 @@
 #include "base/strings/string16.h"
 #include "base/time.h"
 #include "base/timer.h"
+#include "chrome/browser/search/instant_service_observer.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
 #include "chrome/browser/ui/search/instant_commit_type.h"
 #include "chrome/browser/ui/search/instant_overlay_model.h"
@@ -66,7 +67,8 @@ class WebContents;
 // only an InstantOverlay instance is kept.
 //
 // InstantController is owned by Browser via BrowserInstantController.
-class InstantController : public InstantPage::Delegate {
+class InstantController : public InstantPage::Delegate,
+                          public InstantServiceObserver {
  public:
   // For reporting fallbacks to local overlay.
   enum InstantFallbackReason {
@@ -193,8 +195,8 @@ class InstantController : public InstantPage::Delegate {
   // applicable if |extended_enabled_| is true.
   void SetInstantEnabled(bool instant_enabled, bool use_local_page_only);
 
-  // The theme has changed. Pass the message to the overlay page.
-  void ThemeChanged(const ThemeBackgroundInfo& theme_info);
+  // Overridden from InstantServiceObserver:
+  virtual void ThemeInfoChanged(const ThemeBackgroundInfo& theme_info) OVERRIDE;
 
   // Called when someone else swapped in a different contents in the |overlay_|.
   void SwappedOverlayContents();
@@ -243,6 +245,10 @@ class InstantController : public InstantPage::Delegate {
   // happen through the InstantController interface.
   InstantOverlayModel* model() { return &model_; }
 
+  // Sends a request to InstantService to update the InstantServiceObservers
+  // about the theme background information.
+  void UpdateThemeInfo();
+
  protected:
   // Accessors are made protected for testing purposes.
   virtual bool extended_enabled() const;