[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 3d66251f4ad7492274eb2ee428439b953d56c6fd..652378899b08c243f10c5df92d3381f386610906 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.
@@ -1653,6 +1667,12 @@ IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_LoadFont,
                            FontDescriptor /* font to load */,
                            uint32 /* buffer size */,
                            base::SharedMemoryHandle /* font data */)
+
+IPC_MESSAGE_ROUTED1(ViewHostMsg_GotCharacterIndexForPoint,
+                    uint)

[jam, 2011/01/21 18:51:07]

nit: convention is to have each parameter on a separate lines, and add in
comments the parameter_name

[Robert Sesek, 2011/01/21 23:40:07]

Done.

+IPC_MESSAGE_ROUTED1(ViewHostMsg_GotFirstRectForRange, gfx::Rect)
+IPC_MESSAGE_ROUTED1(ViewHostMsg_GotStringForRange,
+                    string16)
 #endif
 
 #if defined(OS_WIN)
@@ -1675,8 +1695,10 @@ 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_ROUTED3(ViewHostMsg_SelectionChanged,
+                    std::string /* currently selected text */,
+                    int /* selection range start */,
+                    int /* selection range end */)
 
 // Asks the browser to display the file chooser.  The result is returned in a
 // ViewHost_RunFileChooserResponse message.