Migrate HostZoomMap to live in StoragePartition.

chrome/browser/profiles/profile.cc

Index: chrome/browser/profiles/profile.cc
diff --git a/chrome/browser/profiles/profile.cc b/chrome/browser/profiles/profile.cc
index 06b7d1730e30132d746b7fa17bd0663a557a8385..b2f74ac1ab4495f160c8e37d6e881a0422ee8d88 100644
--- a/chrome/browser/profiles/profile.cc
+++ b/chrome/browser/profiles/profile.cc
@@ -36,6 +36,8 @@
 #include "extensions/browser/pref_names.h"
 #endif
 
+using content::HostZoomMap;
+
 Profile::Profile()
     : restored_last_session_(false),
       sent_destroyed_notification_(false),
@@ -262,3 +264,39 @@ bool ProfileCompare::operator()(Profile* a, Profile* b) const {
     return false;
   return a->GetOriginalProfile() < b->GetOriginalProfile();
 }
+
+void Profile::TrackZoomLevelsFromParent(Profile* parent) {
+  // This function only makes sense in a derived class that implements
+  // HostZoomMaps.
+  DCHECK(GetProfileType() == INCOGNITO_PROFILE &&
+         parent->GetProfileType() == REGULAR_PROFILE);
+
+  // Here we only want to use zoom levels stored in the main-context's default
+  // storage partition. We're not interested in zoom levels in special
+  // partitions, e.g. those used by WebViewGuests.
+  HostZoomMap* host_zoom_map = HostZoomMap::GetDefaultForBrowserContext(this);
+  HostZoomMap* parent_host_zoom_map =
+      HostZoomMap::GetDefaultForBrowserContext(parent);
+  host_zoom_map->CopyFrom(parent_host_zoom_map);
+  // Observe parenti profile's HostZoomMap changes so they can also be applied
+  // to this profile's HostZoomMap.
+  track_zoom_subscription_ = parent_host_zoom_map->AddZoomLevelChangedCallback(
+      base::Bind(&Profile::TrackZoomLevelChanged, base::Unretained(this)));
+}
+
+void Profile::TrackZoomLevelChanged(
+    const HostZoomMap::ZoomLevelChange& change) {
+  HostZoomMap* host_zoom_map = HostZoomMap::GetDefaultForBrowserContext(this);
+  switch (change.mode) {
+    case HostZoomMap::ZOOM_CHANGED_TEMPORARY_ZOOM:
+       return;
+    case HostZoomMap::ZOOM_CHANGED_FOR_HOST:
+       host_zoom_map->SetZoomLevelForHost(change.host, change.zoom_level);
+       return;
+    case HostZoomMap::ZOOM_CHANGED_FOR_SCHEME_AND_HOST:
+       host_zoom_map->SetZoomLevelForHostAndScheme(change.scheme,
+           change.host,
+           change.zoom_level);
+       return;
+  }
+}