MacViews: Add WidgetEventGenerator to abstract platform-specific event generation for tests.

ui/views/cocoa/bridged_native_widget.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #include "base/logging.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/input_method_factory.h"
 #include "ui/base/ui_base_switches_util.h"
@@ skipping 27 matching lines @@
   // floating around in Cocoa libraries at this point. However, references to
   // the old views::View will be gone, so any method calls will become no-ops.
 
   if (view) {
     bridged_view_.reset([[BridgedContentView alloc] initWithView:view]);
     // 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_);
   }
   [window_ setContentView:bridged_view_];
+  [window_ makeFirstResponder:bridged_view_];
 }
 
 InputMethod* BridgedNativeWidget::CreateInputMethod() {
   if (switches::IsTextInputFocusManagerEnabled())
     return new NullInputMethod();
 
   return new InputMethodBridge(this, GetHostInputMethod(), true);
 }
 
 ui::InputMethod* BridgedNativeWidget::GetHostInputMethod() {
@@ skipping 11 matching lines @@
 void BridgedNativeWidget::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
   // Mac key events don't go through this, but some unit tests that use
   // MockInputMethod do.
   Widget* widget = [bridged_view_ hostedView]->GetWidget();
   widget->OnKeyEvent(const_cast<ui::KeyEvent*>(&key));
   if (!key.handled() && widget->GetFocusManager())
     widget->GetFocusManager()->OnKeyEvent(key);
 }
 
 }  // namespace views