Webview tag creation should be using storage partitions.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 07a05aaf62beab8ac863d64937760cea9972c957..d0507329513701b030b7bed906543477894153c0 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -262,23 +262,7 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual net::URLRequestContext* OverrideRequestContextForURL(
       const GURL& url, ResourceContext* context);
 
-  // Allow the embedder to specify storage parititon id associated with a child
-  // process.
-  //
-  // Child processes that have different storage partition identifiers will
-  // behave as if they belong to different web browsers and not be able to
-  // access each other's cookies, local storage, etc.  IDs must only fit the
-  // pattern [a-z0-9]* (lowercase letters or digits).
-  //
-  // Returns the empty string for the regular storage partition.
-  virtual std::string GetStoragePartitionIdForChildProcess(
-      content::BrowserContext* browser_context,
-      int child_process_id);
-
-  // Same as GetStoragePartitionIdForChildProcess(), but uses a site instead.
-  //
-  // TODO(ajwong): Replace all uses of GetStoragePartitionIdForChildProcess()
-  // with this one.
+  // Allow the embedder to specify storage parititon id associated with a site.
   virtual std::string GetStoragePartitionIdForSite(
       content::BrowserContext* browser_context,
       const GURL& site);
@@ -289,6 +273,15 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual bool IsValidStoragePartitionId(BrowserContext* browser_context,
                                          const std::string& partition_id);
 
+  // Allow the embedder to provide storage parititon description associated with
+  // a site.
+  virtual void GetStoragePartitionConfigForSite(
+      content::BrowserContext* browser_context,
+      const GURL& site,
+      std::string* partition_domain,
+      std::string* partition_name,
+      bool* in_memory);
+
   // Create and return a new quota permission context.
   virtual QuotaPermissionContext* CreateQuotaPermissionContext();