Allow component IME extension use app.window and add 'ime' window type for app window

chrome/renderer/resources/extensions/app_window_custom_bindings.js

Index: chrome/renderer/resources/extensions/app_window_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/app_window_custom_bindings.js b/chrome/renderer/resources/extensions/app_window_custom_bindings.js
index 812d3d6c6af54474773bc45892310b9ce48314e4..27869c39a71b6080fdf961e6133cc5faa012a8b0 100644
--- a/chrome/renderer/resources/extensions/app_window_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/app_window_custom_bindings.js
@@ -244,6 +244,9 @@ appWindow.registerCustomHook(function(bindingsAPI) {
     AppWindow.prototype.alphaEnabled = function() {
       return appWindowData.alphaEnabled;
     };
+    AppWindow.prototype.isImeWindow = function() {
+      return appWindowData.isImeWindow;
+    };
     AppWindow.prototype.handleWindowFirstShownForTests = function(callback) {
       // This allows test apps to get have their callback run even if they
       // call this after the first show has happened.
@@ -305,7 +308,8 @@ appWindow.registerCustomHook(function(bindingsAPI) {
       hasFrameColor: params.hasFrameColor,
       activeFrameColor: params.activeFrameColor,
       inactiveFrameColor: params.inactiveFrameColor,
-      alphaEnabled: params.alphaEnabled
+      alphaEnabled: params.alphaEnabled,
+      isImeWindow: params.isImeWindow
     };
     currentAppWindow = new AppWindow;
   });
@@ -398,4 +402,4 @@ function updateSizeConstraints(boundsType, constraints) {
 exports.binding = appWindow.generate();
 exports.onAppWindowClosed = onAppWindowClosed;
 exports.updateAppWindowProperties = updateAppWindowProperties;
-exports.appWindowShownForTests = onAppWindowShownForTests;
+exports.appWindowShownForTests = onAppWindowShownForTests;