Migrate HostZoomMap to live in StoragePartition.

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index dd744923a9e5f0a14e6486df58f558a56907a771..5070efa9b302e31116ee76492e65f2153d1ccfa5 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -15,6 +15,7 @@
 #include "components/domain_reliability/clear_mode.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/content_browser_client.h"
+#include "content/public/browser/host_zoom_map.h"
 
 class ChromeAppCacheService;
 class DevToolsNetworkController;
@@ -395,7 +396,23 @@ class Profile : public content::BrowserContext {
   // Creates an OffTheRecordProfile which points to this Profile.
   Profile* CreateOffTheRecordProfile();
 
+  // Convenience method to retrieve the default zoom level for the default
+  // storage partition.
+  double GetDefaultZoomLevel();

[Fady Samuel, 2014/11/03 22:11:11]

nit: Can this be a const method?

[wjmaclean, 2014/11/04 19:34:25]

Sadly, no, as the profile has to pass |this| to GetDefaultStoragePartition,
which is non-const (since it might actually create the storage partition I
suppose).

+
+ protected:
+  // Allows a profile to track changes in zoom levels in another profile.
+  // This function, along with TrackZoomLevelChanged(), are placed in Profile
+  // to facilitate testing with TestingProfile.
+  void TrackZoomLevelsFromParent(Profile* parent);
+
  private:
+  // Callback function for tracking parent's zoom level changes.
+  void TrackZoomLevelChanged(
+      const content::HostZoomMap::ZoomLevelChange& change);
+
+  scoped_ptr<content::HostZoomMap::Subscription> track_zoom_subscription_;
+
   bool restored_last_session_;
 
   // Used to prevent the notification that this Profile is destroyed from