Support mozc suggest window on ChromeOS.

chrome/browser/chromeos/input_method/mozc_commands.diff

+Index: commands.proto
+===================================================================
+--- commands.proto      (revision 58)
++++ commands.proto      (working copy)
+@@ -219,6 +219,13 @@
+ };
+ 
+ 
++message Rectangle {
++  required int32 x = 1;
++  required int32 y = 2;
++  required int32 width = 3;
++  required int32 height = 4;
++}
++
+ message SessionCommand {
+   enum CommandType {
+     // Revert the session, this is usually similar to type ESC several times.
+@@ -255,6 +262,12 @@
+ 
+     // Change cursor position in preedit.
+     MOVE_CURSOR = 11;
++
++    // The client can send the current caret position whenever the caret
++    // position is changed. The caret position is used for suggest window
++    // position calculation. This is an optional message. If client can show
++    // suggest window on the correct position, this message can be ignored.
++    SEND_CARET_LOCATION = 12;
+   };
+   required CommandType type = 1;
+ 
+@@ -269,6 +282,10 @@
+ 
+   // New cursor position in preedit. Used with MOVE_CURSOR.
+   optional uint32 cursor_position = 5;
++
++  // Specify the current caret location, this is used for suggest window
++  // position calculation. Used with SEND_CARET_LOCATION.
++  optional Rectangle caret_rectangle = 9;
+ };
+ 
+ message Context {
+@@ -582,6 +599,20 @@
+     HORIZONTAL = 1;
+   };
+   optional Direction direction = 14 [ default = VERTICAL ];
++
++  // This position is used for suggest window position.
++  optional Rectangle composition_rectangle = 15;
++  optional Rectangle caret_rectangle = 16;
++
++  enum CandidateWindowLocation{
++    // Shows candidate window under the caret. This is used for prediction and
++    // conversion
++    CARET = 0;
++    // Shows candidate window aligned with composition area. This is used for
++    // suggestion.
++    COMPOSITION = 1;
++  }
++  optional CandidateWindowLocation window_location = 17;
+ };
+ 
+ message Status {