IME for Mus: Send TextInputClient information to IMEDriver.

services/ui/public/interfaces/ime/ime.mojom

Index: services/ui/public/interfaces/ime/ime.mojom
diff --git a/services/ui/public/interfaces/ime/ime.mojom b/services/ui/public/interfaces/ime/ime.mojom
index d999b3353a4b1f2c313a919b69cb7d4196b8f17a..86b8cb4b21d2997c2554e832f3c1bd62d4de83ce 100644
--- a/services/ui/public/interfaces/ime/ime.mojom
+++ b/services/ui/public/interfaces/ime/ime.mojom
@@ -4,6 +4,7 @@
 
 module ui.mojom;
 
+import "mojo/common/rtl.mojom";
 import "ui/events/mojo/event.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "ui/gfx/range/mojo/range.mojom";
@@ -64,14 +65,26 @@ enum TextInputMode {
   URL,
 };
 
+// Parameters needed to start an IME session.
+struct StartSessionDetails {
+  TextInputClient client;
+  InputMethod& input_method_request;
+
+  // Initial details about |client| required by IMEDriver.
+  TextInputType text_input_type;
+  TextInputMode text_input_mode;
+  mojo.common.mojom.TextDirection text_direction;
+  int32 text_input_flags;
+  gfx.mojom.Rect caret_bounds;
+};
+
 // A service which provides the IMEDriver interface is responsible for doing
 // the composition logic. After starting a session, it receives events from
 // the client via the InputMethod interface, and sends composition events to
 // the client via the TextInputClient.
 interface IMEDriver {
   // session_id is unique and generated by Mus.
-  StartSession(int32 session_id, TextInputClient client,
-               InputMethod& input_method);
+  StartSession(int32 session_id, StartSessionDetails details);
   CancelSession(int32 session_id);
 };
 
@@ -79,8 +92,7 @@ interface IMEDriver {
 // does minimal processing and mostly just acts as lightweight proxy between
 // the client app and the registered IME driver.
 interface IMEServer {
-  StartSession(TextInputClient client,
-               InputMethod& input_method);
+  StartSession(StartSessionDetails details);
 };
 
 // An IME driver register should register itself to Mus using the IMERegistrar