Make DispatchKeyEventPostIME() asynchronous.

chrome/browser/ui/views/ime_driver/input_method_bridge_chromeos_unittest.cc

 // Copyright 2016 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.
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 69 matching lines @@
       run_loop_->Quit();
   }
   void InsertChar(std::unique_ptr<ui::Event> event) override {
     ASSERT_TRUE(event->IsKeyEvent());
     CompositionEvent ev = {CompositionEventType::INSERT_CHAR, base::string16(),
                            event->AsKeyEvent()->GetCharacter()};
     receieved_event_ = ev;
     if (run_loop_)
       run_loop_->Quit();
   }
+  void DispatchKeyEventPostIME(
+      std::unique_ptr<ui::Event> event,
+      const DispatchKeyEventPostIMECallback& callback) override {
+    callback.Run(false);
+  }
 
   mojo::Binding<ui::mojom::TextInputClient> binding_;
   std::unique_ptr<base::RunLoop> run_loop_;
   base::Optional<CompositionEvent> receieved_event_;
 
   DISALLOW_COPY_AND_ASSIGN(TestTextInputClient);
 };
 
 class InputMethodBridgeChromeOSTest : public testing::Test {
  public:
@@ skipping 96 matching lines @@
 
 // Test that Ctrl-C, Ctrl-X, and Ctrl-V are not handled.
 TEST_F(InputMethodBridgeChromeOSTest, ClipboardAccelerators) {
   EXPECT_FALSE(ProcessKeyEvent(UnicodeKeyPress(ui::VKEY_C, ui::DomCode::US_C,
                                                ui::EF_CONTROL_DOWN, 'C')));
   EXPECT_FALSE(ProcessKeyEvent(UnicodeKeyPress(ui::VKEY_X, ui::DomCode::US_X,
                                                ui::EF_CONTROL_DOWN, 'X')));
   EXPECT_FALSE(ProcessKeyEvent(UnicodeKeyPress(ui::VKEY_V, ui::DomCode::US_V,
                                                ui::EF_CONTROL_DOWN, 'V')));
 }