Adds selection expansion support for Contextual Search.

content/common/view_messages.h

 // Copyright (c) 2012 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 page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 973 matching lines @@
                     uint32 /* output_surface_id */,
                     cc::CompositorFrameAck /* ack */)
 
 // Sent by browser to give renderer compositor a new namespace ID for any
 // SurfaceSequences it has to create.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetSurfaceIdNamespace,
                     uint32_t /* surface_id_namespace */)
 
 IPC_MESSAGE_ROUTED0(ViewMsg_SelectWordAroundCaret)
 
+// Sent by the browser to ask the renderer to expand the selection
+// by the given amounts.
+IPC_MESSAGE_ROUTED2(ViewMsg_ExpandSelectionByCharacterOffset,
+                    int /* start_adjust*/,
+                    int /* end_adjust */)
+
 // Sent by the browser to ask the renderer to redraw.
 // If |request_id| is not zero, it is added to the forced frame's latency info
 // as ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT.
 IPC_MESSAGE_ROUTED1(ViewMsg_ForceRedraw,
                     int /* request_id */)
 
 // Sent by the browser when the renderer should generate a new frame.
 IPC_MESSAGE_ROUTED1(ViewMsg_BeginFrame,
                     cc::BeginFrameArgs /* args */)
 
@@ skipping 611 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             base::string16 /* characters */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.