InstantExtended: Add js api for custom logo.

chrome/browser/instant/instant_loader_delegate.h

Index: chrome/browser/instant/instant_loader_delegate.h
diff --git a/chrome/browser/instant/instant_loader_delegate.h b/chrome/browser/instant/instant_loader_delegate.h
index 8868d1ebb7eb3cc5b078307070478cf2a62765dc..e71d5c41ac9f2ad707c857929e52f123dd90b0b0 100644
--- a/chrome/browser/instant/instant_loader_delegate.h
+++ b/chrome/browser/instant/instant_loader_delegate.h
@@ -28,6 +28,10 @@ class InstantLoaderDelegate {
                                        int height,
                                        InstantSizeUnits units) = 0;
 
+  // Indicates whether the search provider would like to show a custom logo on
+  // the NTP.
+  virtual void SetHasCustomLogo(InstantLoader* loader, bool has_logo) = 0;
+
   // Notification that the first page load (of the Instant URL) completed.
   virtual void InstantLoaderPreviewLoaded(InstantLoader* loader) = 0;