Implement Input Method related WebPlugin interface for browser plugin

content/common/browser_plugin/browser_plugin_messages.h

Index: content/common/browser_plugin/browser_plugin_messages.h
diff --git a/content/common/browser_plugin/browser_plugin_messages.h b/content/common/browser_plugin/browser_plugin_messages.h
index 3fc331c229737ac9468b747e9aba0704f448de72..42a40d1a735faea8015b4636f5c9e4ba89150a10 100644
--- a/content/common/browser_plugin/browser_plugin_messages.h
+++ b/content/common/browser_plugin/browser_plugin_messages.h
@@ -21,6 +21,7 @@
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_utils.h"
+#include "third_party/WebKit/public/web/WebCompositionUnderline.h"
 #include "third_party/WebKit/public/web/WebDragOperation.h"
 #include "third_party/WebKit/public/web/WebDragStatus.h"
 #include "ui/gfx/point.h"
@@ -154,6 +155,24 @@ IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetEditCommandsForNextKeyEvent,
                     int /* instance_id */,
                     std::vector<content::EditCommand> /* edit_commands */)
 
+// This message is sent from BrowserPlugin to BrowserPluginGuest whenever IME
+// composition state is updated.
+IPC_MESSAGE_ROUTED5(
+    BrowserPluginHostMsg_ImeSetComposition,
+    int /* instance_id */,
+    std::string /* text */,
+    std::vector<blink::WebCompositionUnderline> /* underlines */,
+    int /* selectiont_start */,
+    int /* selection_end */)
+
+// This message is sent from BrowserPlugin to BrowserPluginGuest to notify that
+// confirming the current composition is requested.
+IPC_MESSAGE_ROUTED3(
+    BrowserPluginHostMsg_ImeConfirmComposition,
+    int /* instance_id */,
+    std::string /* text */,
+    bool /* keep selection */)
+
 // This message is sent to the browser process to enable or disable autosize
 // mode.
 IPC_MESSAGE_ROUTED3(
@@ -370,4 +389,3 @@ IPC_MESSAGE_CONTROL5(BrowserPluginMsg_CompositorFrameSwapped,
 IPC_MESSAGE_CONTROL2(BrowserPluginMsg_SetMouseLock,
                      int /* instance_id */,
                      bool /* enable */)
-