Migrate HostZoomMap to live in StoragePartition.

content/public/browser/host_zoom_map.h

Index: content/public/browser/host_zoom_map.h
diff --git a/content/public/browser/host_zoom_map.h b/content/public/browser/host_zoom_map.h
index e65b443d2b4a64590e3aca78ef3ba45c3a0873d5..5ad89e9cfc0d4f96340f246df0f56ac9feda81d2 100644
--- a/content/public/browser/host_zoom_map.h
+++ b/content/public/browser/host_zoom_map.h
@@ -13,11 +13,13 @@
 #include "base/callback.h"
 #include "base/callback_list.h"
 #include "content/common/content_export.h"
+#include "url/gurl.h"
 
 namespace content {
 
 class BrowserContext;
 class ResourceContext;
+class SiteInstance;
 class WebContents;
 
 // Maps hostnames to custom zoom levels.  Written on the UI thread and read on
@@ -39,6 +41,7 @@ class HostZoomMap {
                                       // pair.
     ZOOM_CHANGED_TEMPORARY_ZOOM,      // Temporary zoom change for specific
                                       // renderer, no scheme/host is specified.
+    ZOOM_CHANGED_DEFAULT_ZOOM_LEVEL,  // Notify when default level changes.
   };
 
   // Structure used to notify about zoom changes. Host and/or scheme are empty
@@ -52,9 +55,20 @@ class HostZoomMap {
 
   typedef std::vector<ZoomLevelChange> ZoomLevelVector;
 
-  CONTENT_EXPORT static HostZoomMap* GetForBrowserContext(
+  CONTENT_EXPORT static HostZoomMap* GetDefaultForBrowserContext(
       BrowserContext* browser_context);
 
+  // Returns the HostZoomMap associated with this SiteInstance. The SiteInstance
+  // may serve multiple WebContents, and the HostZoomMap is the same for all of
+  // these WebContents.
+  CONTENT_EXPORT static HostZoomMap* Get(SiteInstance* instance);
+
+  // Returns the HostZoomMap associated with this WebContents. If multiple
+  // WebContents share the same SiteInstance, then they share a single
+  // HostZoomMap.
+  CONTENT_EXPORT static HostZoomMap* GetForWebContents(
+      const WebContents* contents);
+
   // Returns the current zoom level for the specified WebContents. May be
   // temporary or host-specific.
   CONTENT_EXPORT static double GetZoomLevel(const WebContents* web_contents);