Initial inline web store install bindings.

chrome/common/extensions/extension_messages.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include "base/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 292 matching lines @@
 // Send from the renderer to the browser to return the script running result.
 IPC_MESSAGE_ROUTED3(ExtensionHostMsg_ExecuteCodeFinished,
                     int /* request id */,
                     bool /* whether the script ran successfully */,
                     std::string /* error message */)
 
 IPC_MESSAGE_ROUTED2(ExtensionHostMsg_DidGetApplicationInfo,
                     int32 /* page_id */,
                     WebApplicationInfo)
 
-// Sent by the renderer to implement chrome.app.installApplication().
+// Sent by the renderer to implement chrome.app.install().
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_InstallApplication,
                     WebApplicationInfo)
+
+// Sent by the renderer to implement chrome.webstore.install().
+IPC_MESSAGE_ROUTED1(ExtensionHostMsg_InlineWebstoreInstall,
+                    std::string /* Web Store item ID */)