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

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
diff --git a/chrome/common/render_messages_internal.h b/chrome/common/render_messages_internal.h
index aa9172e0856b1dc72bdd65ed39656cdaecba9240..3adbf49827f487b50df64f93a92bf9d8fffcc28d 100644
--- a/chrome/common/render_messages_internal.h
+++ b/chrome/common/render_messages_internal.h
@@ -892,6 +892,20 @@ IPC_MESSAGE_ROUTED2(ViewMsg_WindowFrameChanged,
 IPC_MESSAGE_ROUTED2(ViewMsg_PluginImeCompositionConfirmed,
                     string16 /* text */,
                     int /* plugin_id */)
+
+// Tells the renderer to send back the character index for a point.
+IPC_MESSAGE_ROUTED1(ViewMsg_CharacterIndexForPoint,
+                    gfx::Point)
+
+// Tells the renderer to send back the rectangle for a given character range.
+IPC_MESSAGE_ROUTED2(ViewMsg_FirstRectForCharacterRange,
+                    uint /* location */,
+                    uint /* length */)
+
+// Tells the renderer to send back the text fragment in a given range.
+IPC_MESSAGE_ROUTED2(ViewMsg_StringForRange,
+                    uint /* location */,
+                    uint /* length */)
 #endif
 
 // Response message to ViewHostMsg_CreateShared/DedicatedWorker.
@@ -1649,6 +1663,12 @@ IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_LoadFont,
                            FontDescriptor /* font to load */,
                            uint32 /* buffer size */,
                            base::SharedMemoryHandle /* font data */)
+
+IPC_MESSAGE_ROUTED1(ViewHostMsg_GotCharacterIndexForPoint,
+                    uint)
+IPC_MESSAGE_ROUTED1(ViewHostMsg_GotFirstRectForRange, gfx::Rect)
+IPC_MESSAGE_ROUTED1(ViewHostMsg_GotStringForRange,
+                    string16)
 #endif
 
 #if defined(OS_WIN)