Add BrowserContext::GetQuotaManagerForRenderProcess for the isolated app feature.

content/browser/browser_context.cc

Index: content/browser/browser_context.cc
===================================================================
--- content/browser/browser_context.cc	(revision 150659)
+++ content/browser/browser_context.cc	(working copy)
@@ -130,13 +130,16 @@
       context, kDownloadManagerKeyName);
 }
 
-quota::QuotaManager* BrowserContext::GetQuotaManager(
+quota::QuotaManager* BrowserContext::GetDefaultQuotaManager(
     BrowserContext* browser_context) {
-  // TODO(ajwong): Change this API to require a process id instead of using
-  // kInvalidChildProcessId.
-  StoragePartition* partition =
-      GetStoragePartition(browser_context,
-                          ChildProcessHostImpl::kInvalidChildProcessId);
+  return GetQuotaManagerForRenderProcess(
+      browser_context, ChildProcessHostImpl::kInvalidChildProcessId);
+}
+
+quota::QuotaManager* BrowserContext::GetQuotaManagerForRenderProcess(
+    BrowserContext* browser_context, int renderer_child_id) {
+  StoragePartition* partition = GetStoragePartition(
+      browser_context, renderer_child_id);
   return partition->quota_manager();
 }