[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index f8be887d89f7482e12b10cf018dcd4d46825da5a..cbfd3231420df5569d0bbfbdad29ce023d015e96 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -25,6 +25,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupType.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextInputType.h"
+#include "ui/base/range/range.h"
 #include "ui/gfx/rect.h"
 #include "webkit/glue/context_menu.h"
 #include "webkit/glue/password_form.h"
@@ -1682,8 +1683,9 @@ IPC_MESSAGE_ROUTED2(ViewHostMsg_SetTooltipText,
                     WebKit::WebTextDirection /* text direction hint */)
 
 // Notification that the text selection has changed.
-IPC_MESSAGE_ROUTED1(ViewHostMsg_SelectionChanged,
-                    std::string /* currently selected text */)
+IPC_MESSAGE_ROUTED2(ViewHostMsg_SelectionChanged,
+                    std::string /* currently selected text */,
+                    ui::Range /* selection range */)
 
 // Asks the browser to display the file chooser.  The result is returned in a
 // ViewHost_RunFileChooserResponse message.
@@ -1715,6 +1717,11 @@ IPC_MESSAGE_ROUTED2(ViewHostMsg_ImeUpdateTextInputState,
                     WebKit::WebTextInputType, /* text_input_type */
                     gfx::Rect /* caret_rect */)
 
+
+// Message sent when the IME text composition range changes.
+IPC_MESSAGE_ROUTED1(ViewHostMsg_ImeCompositionRangeChanged,
+                    ui::Range /* composition range */)
+
 // Required for cancelling an ongoing input method composition.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_ImeCancelComposition)