Plumb composition character bounds for Android 5.0

content/common/input_messages.h

 // Copyright (c) 2013 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 input events and other messages that require processing in
 // order relative to input events.
 // Multiply-included message file, hence no include guard.
 
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
@@ skipping 222 matching lines @@
                     content::TouchAction /* touch_action */)
 
 // Sent by the compositor when input scroll events are dropped due to bounds
 // restrictions on the root scroll offset.
 IPC_MESSAGE_ROUTED1(InputHostMsg_DidOverscroll,
                     content::DidOverscrollParams /* params */)
 
 // Required for cancelling an ongoing input method composition.
 IPC_MESSAGE_ROUTED0(InputHostMsg_ImeCancelComposition)
 
-#if defined(OS_MACOSX) || defined(USE_AURA)
+#if defined(OS_MACOSX) || defined(USE_AURA) || defined(OS_ANDROID)
 // On Mac and Aura IME can request composition character bounds
 // synchronously (see crbug.com/120597). This IPC message sends the character
 // bounds after every composition change to always have correct bound info.
+// This IPC message is also used on Android 5.0 and above.
 IPC_MESSAGE_ROUTED2(InputHostMsg_ImeCompositionRangeChanged,
                     gfx::Range /* composition range */,
                     std::vector<gfx::Rect> /* character bounds */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent InputMsg, then ifdefs for platform specific InputMsg, then
 // platform independent InputHostMsg, then ifdefs for platform specific
 // InputHostMsg.