MacViews: Implement text input.

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index f4efcb249d13e83a09ff5afd023d874b44851829..a5e26e6acc8d1f388f175b639129305c375babb7 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -39,7 +39,8 @@ void BridgedNativeWidget::SetRootView(views::View* view) {
   // the old views::View will be gone, so any method calls will become no-ops.
 
   if (view) {
-    bridged_view_.reset([[BridgedContentView alloc] initWithView:view]);
+    bridged_view_.reset(
+        [[BridgedContentView alloc] initWithView:view parent:this]);
     // Objective C initializers can return nil. However, if |view| is non-NULL
     // this should be treated as an error and caught early.
     CHECK(bridged_view_);
@@ -76,4 +77,15 @@ void BridgedNativeWidget::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
     widget->GetFocusManager()->OnKeyEvent(key);
 }
 
+void BridgedNativeWidget::OnWillChangeFocus(View* focused_before,
+                                            View* focused_now) {
+}
+
+void BridgedNativeWidget::OnDidChangeFocus(View* focused_before,
+                                           View* focused_now) {
+  ui::TextInputClient* input_client =
+      focused_now ? focused_now->GetTextInputClient() : NULL;
+  [bridged_view_ setTextInputClient:input_client];
+}
+
 }  // namespace views