Add chrome.webstore API methods to allow sites to see progress of installation

chrome/common/extensions/chrome_extension_messages.h

 // Copyright 2014 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.
 
 // Chrome-specific IPC messages for extensions.
 // Extension-related messages that aren't specific to Chrome live in
 // extensions/common/extension_messages.h.
 //
 // Multiply-included message file, hence no include guard.
 
+#include "chrome/common/extensions/api/webstore/webstore_api_constants.h"
 #include "chrome/common/web_application_info.h"
 #include "ipc/ipc_message_macros.h"
 
 #define IPC_MESSAGE_START ChromeExtensionMsgStart
 
+IPC_ENUM_TRAITS_MAX_VALUE(extensions::api::webstore::InstallStage,
+                          extensions::api::webstore::INSTALL_STAGE_INSTALLING)
+
 IPC_STRUCT_TRAITS_BEGIN(WebApplicationInfo::IconInfo)
   IPC_STRUCT_TRAITS_MEMBER(url)
   IPC_STRUCT_TRAITS_MEMBER(width)
   IPC_STRUCT_TRAITS_MEMBER(height)
   IPC_STRUCT_TRAITS_MEMBER(data)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(WebApplicationInfo)
   IPC_STRUCT_TRAITS_MEMBER(title)
   IPC_STRUCT_TRAITS_MEMBER(description)
   IPC_STRUCT_TRAITS_MEMBER(app_url)
   IPC_STRUCT_TRAITS_MEMBER(icons)
 IPC_STRUCT_TRAITS_END()
 
 // Messages sent from the browser to the renderer.
 
 // Requests application info for the page. The renderer responds back with
 // ExtensionHostMsg_DidGetApplicationInfo.
 IPC_MESSAGE_ROUTED1(ChromeExtensionMsg_GetApplicationInfo,
                     int32 /* page_id */)
 
+// Sent by the renderer to implement chrome.webstore.install().
+IPC_MESSAGE_ROUTED5(ExtensionHostMsg_InlineWebstoreInstall,
+                    int32 /* install id */,
+                    int32 /* return route id */,
+                    std::string /* Web Store item ID */,
+                    GURL /* requestor URL */,
+                    int /* listeners_mask */)
+
+// Sent to the renderer if install stage updates were requested for an inline
+// install.
+IPC_MESSAGE_ROUTED1(ExtensionMsg_InlineInstallStageChanged,
+                    extensions::api::webstore::InstallStage /* stage */)
+
+// Sent to the renderer if download progress updates were requested for an
+// inline install.
+IPC_MESSAGE_ROUTED1(ExtensionMsg_InlineInstallDownloadProgress,
+                    int /* percent_downloaded */)
+
+// Send to renderer once the installation mentioned on
+// ExtensionHostMsg_InlineWebstoreInstall is complete.
+IPC_MESSAGE_ROUTED3(ExtensionMsg_InlineWebstoreInstallResponse,
+                    int32 /* install id */,
+                    bool /* whether the install was successful */,
+                    std::string /* error */)
+
 // Messages sent from the renderer to the browser.
 
 IPC_MESSAGE_ROUTED2(ChromeExtensionHostMsg_DidGetApplicationInfo,
                     int32 /* page_id */,
                     WebApplicationInfo)