Add the backchannel for Blobs to be received into Blink from the database backend.

Source/modules/indexeddb/WebIDBCallbacksImpl.h

Index: Source/modules/indexeddb/WebIDBCallbacksImpl.h
diff --git a/Source/modules/indexeddb/WebIDBCallbacksImpl.h b/Source/modules/indexeddb/WebIDBCallbacksImpl.h
index 44eb023c00bb0cba2a4a25fcea8cc4dd1f7cd6c6..1772f36025ece635bad9d1ddc188210bb3f16224 100644
--- a/Source/modules/indexeddb/WebIDBCallbacksImpl.h
+++ b/Source/modules/indexeddb/WebIDBCallbacksImpl.h
@@ -35,6 +35,7 @@
 #include "wtf/RefPtr.h"
 
 namespace blink {
+class WebBlobInfo;
 class WebData;
 class WebIDBCursor;
 class WebIDBDatabase;
@@ -57,14 +58,22 @@ public:
     // Pointers transfer ownership.
     virtual void onError(const blink::WebIDBDatabaseError&) OVERRIDE;
     virtual void onSuccess(const blink::WebVector<blink::WebString>&) OVERRIDE;
-    virtual void onSuccess(blink::WebIDBCursor*, const blink::WebIDBKey&, const blink::WebIDBKey& primaryKey, const blink::WebData&) OVERRIDE;
+    // TODO(ericu): Remove this version, here only for the 3-side patch dance.
+    virtual void onSuccess(blink::WebIDBCursor*, const blink::WebIDBKey&, const blink::WebIDBKey& primaryKey, const blink::WebData&);
+    virtual void onSuccess(blink::WebIDBCursor*, const blink::WebIDBKey&, const blink::WebIDBKey& primaryKey, const blink::WebData&, const blink::WebVector<blink::WebBlobInfo>&) OVERRIDE;
     virtual void onSuccess(blink::WebIDBDatabase*, const blink::WebIDBMetadata&) OVERRIDE;
     virtual void onSuccess(const blink::WebIDBKey&) OVERRIDE;
-    virtual void onSuccess(const blink::WebData&) OVERRIDE;
-    virtual void onSuccess(const blink::WebData&, const blink::WebIDBKey&, const blink::WebIDBKeyPath&) OVERRIDE;
+    // TODO(ericu): Remove this version, here only for the 3-side patch dance.
+    virtual void onSuccess(const blink::WebData&);
+    virtual void onSuccess(const blink::WebData&, const blink::WebVector<blink::WebBlobInfo>&) OVERRIDE;
+    // TODO(ericu): Remove this version, here only for the 3-side patch dance.
+    virtual void onSuccess(const blink::WebData&, const blink::WebIDBKey&, const blink::WebIDBKeyPath&);
+    virtual void onSuccess(const blink::WebData&, const blink::WebVector<blink::WebBlobInfo>&, const blink::WebIDBKey&, const blink::WebIDBKeyPath&) OVERRIDE;
     virtual void onSuccess(long long) OVERRIDE;
     virtual void onSuccess() OVERRIDE;
-    virtual void onSuccess(const blink::WebIDBKey&, const blink::WebIDBKey& primaryKey, const blink::WebData&) OVERRIDE;
+    // TODO(ericu): Remove this version, here only for the 3-side patch dance.
+    virtual void onSuccess(const blink::WebIDBKey&, const blink::WebIDBKey& primaryKey, const blink::WebData&);
+    virtual void onSuccess(const blink::WebIDBKey&, const blink::WebIDBKey& primaryKey, const blink::WebData&, const blink::WebVector<blink::WebBlobInfo>&) OVERRIDE;
     virtual void onBlocked(long long oldVersion) OVERRIDE;
     virtual void onUpgradeNeeded(long long oldVersion, blink::WebIDBDatabase*, const blink::WebIDBMetadata&, unsigned short dataLoss, blink::WebString dataLossMessage) OVERRIDE;