Revert of Remove a bunch of NPAPI quirks and related support code

content/child/plugin_messages.h

Index: content/child/plugin_messages.h
diff --git a/content/child/plugin_messages.h b/content/child/plugin_messages.h
index 63a0f45893c85860b0754d9eac04158b9fc1ff4e..f6ceca208544b1f87fdd05d814eb2c150c6f013d 100644
--- a/content/child/plugin_messages.h
+++ b/content/child/plugin_messages.h
@@ -111,6 +111,17 @@
 IPC_MESSAGE_CONTROL1(PluginMsg_ResetModalDialogEvent,
                      int /* render_view_id */)
 
+#if defined(OS_WIN)
+IPC_MESSAGE_ROUTED4(PluginMsg_ImeCompositionUpdated,
+                    base::string16 /* text */,
+                    std::vector<int> /* clauses */,
+                    std::vector<int>, /* target */
+                    int /* cursor_position */)
+
+IPC_MESSAGE_ROUTED1(PluginMsg_ImeCompositionCompleted,
+                    base::string16 /* text */)
+#endif
+
 #if defined(OS_MACOSX)
 IPC_MESSAGE_ROUTED1(PluginMsg_SetWindowFocus,
                     bool /* has_focus */)
@@ -170,6 +181,26 @@
                             std::string /* message */)
 
 IPC_MESSAGE_CONTROL0(PluginHostMsg_PluginShuttingDown)
+
+#if defined(OS_WIN)
+// The modal_loop_pump_messages_event parameter is an event handle which is
+// passed in for windowless plugins and is used to indicate if messages
+// are to be pumped in sync calls to the plugin process. Currently used
+// in HandleEvent calls.
+IPC_SYNC_MESSAGE_ROUTED2_0(PluginHostMsg_SetWindowlessData,
+                           HANDLE /* modal_loop_pump_messages_event */,
+                           gfx::NativeViewId /* dummy_activation_window*/)
+
+// Send the IME status retrieved from a windowless plugin. A windowless plugin
+// uses the IME attached to a browser process as a renderer does. A plugin
+// sends this message to control the IME status of a browser process. I would
+// note that a plugin sends this message to a renderer process that hosts this
+// plugin (not directly to a browser process) so the renderer process can
+// update its IME status.
+IPC_MESSAGE_ROUTED2(PluginHostMsg_NotifyIMEStatus,
+                    int /* input_type */,
+                    gfx::Rect /* caret_rect */)
+#endif
 
 #if defined(OS_MACOSX)
 IPC_MESSAGE_ROUTED1(PluginHostMsg_FocusChanged,