add voice interaction shortcut.

chrome/browser/chromeos/arc/arc_voice_interaction_service.cc

+// Copyright 2017 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 "chrome/browser/chromeos/arc/arc_voice_interaction_service.h"
+
+#include <vector>
+
+#include "ash/common/accelerators/accelerator_controller.h"
+#include "ash/common/wm_shell.h"
+#include "ash/shell.h"
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_features.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace arc {
+
+namespace {
+
+constexpr char kEnableVoiceInteraction[] = "enable-voice-interaction";
+
+const ui::Accelerator kVoiceInteractionAccelerator(ui::VKEY_A,
+                                                   ui::EF_COMMAND_DOWN);
+
+}  // namespace
+
+class ArcVoiceInteractionService::ArcHomeObserver
+    : public InstanceHolder<mojom::VoiceInteractionArcHomeInstance>::Observer {
+ public:
+  explicit ArcHomeObserver(ArcVoiceInteractionService* service)
+      : service_(service) {}
+  void OnInstanceReady() override { service_->OnArcHomeInstanceReady(); }
+  void OnInstanceClosed() override { service_->OnArcHomeInstanceClosed(); }
+
+ private:
+  ArcVoiceInteractionService* service_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcHomeObserver);
+};
+
+class ArcVoiceInteractionService::CaptureObserver
+    : public InstanceHolder<mojom::VoiceInteractionCaptureInstance>::Observer {
+ public:
+  explicit CaptureObserver(ArcVoiceInteractionService* service)
+      : service_(service) {}
+  void OnInstanceReady() override { service_->OnCaptureInstanceReady(); }
+  void OnInstanceClosed() override { service_->OnCaptureInstanceClosed(); }
+
+ private:
+  ArcVoiceInteractionService* service_;
+
+  DISALLOW_COPY_AND_ASSIGN(CaptureObserver);
+};
+
+ArcVoiceInteractionService::ArcVoiceInteractionService(
+    ArcBridgeService* bridge_service)
+    : ArcService(bridge_service),
+      home_observer_(base::MakeUnique<ArcHomeObserver>(this)),
+      capture_observer_(base::MakeUnique<CaptureObserver>(this)),
+      home_binding_(this),
+      capture_binding_(this) {
+  arc_bridge_service()->voice_interaction_capture()->AddObserver(
+      capture_observer_.get());
+  arc_bridge_service()->voice_interaction_home()->AddObserver(
+      home_observer_.get());
+}
+
+ArcVoiceInteractionService::~ArcVoiceInteractionService() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  arc_bridge_service()->voice_interaction_home()->RemoveObserver(
+      home_observer_.get());
+  arc_bridge_service()->voice_interaction_capture()->RemoveObserver(
+      capture_observer_.get());
+}
+
+void ArcVoiceInteractionService::OnArcHomeInstanceReady() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  mojom::VoiceInteractionArcHomeInstance* arc_home_instance =
+      ARC_GET_INSTANCE_FOR_METHOD(
+          arc_bridge_service()->voice_interaction_home(), Init);
+  DCHECK(arc_home_instance);
+  arc_home_instance->Init(home_binding_.CreateInterfacePtrAndBind());
+}
+
+void ArcVoiceInteractionService::OnArcHomeInstanceClosed() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+}
+
+void ArcVoiceInteractionService::OnCaptureInstanceReady() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  mojom::VoiceInteractionCaptureInstance* arc_capture_instance =
+      ARC_GET_INSTANCE_FOR_METHOD(
+          arc_bridge_service()->voice_interaction_capture(), Init);
+  DCHECK(arc_capture_instance);
+  arc_capture_instance->Init(capture_binding_.CreateInterfacePtrAndBind());
+
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          kEnableVoiceInteraction)) {
+    ash::WmShell::Get()->accelerator_controller()->Register(
+        {kVoiceInteractionAccelerator}, this);
+  }
+}
+
+void ArcVoiceInteractionService::OnCaptureInstanceClosed() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          kEnableVoiceInteraction)) {
+    ash::WmShell::Get()->accelerator_controller()->Unregister(
+        kVoiceInteractionAccelerator, this);
+  }
+}
+
+bool ArcVoiceInteractionService::AcceleratorPressed(
+    const ui::Accelerator& accelerator) {
+  mojom::VoiceInteractionCaptureInstance* capture_instance_ =

[xc, 2017/03/09 05:05:47]

no surfix _ for local variable

[Muyuan, 2017/03/09 20:44:44]

Done.

+      ARC_GET_INSTANCE_FOR_METHOD(
+          arc_bridge_service()->voice_interaction_capture(),
+          StartVoiceInteractionSession);
+  DCHECK(capture_instance_);
+  capture_instance_->StartVoiceInteractionSession();

[xc, 2017/03/09 05:05:47]

I think we need to explicitly check null here.  otherwise it would crash browser
if user hit meta+a quickly after login. 

[Muyuan, 2017/03/09 20:44:44]

The key is registered only after the Arc instance starts, which means it should
never be null...

+  return true;
+}
+
+bool ArcVoiceInteractionService::CanHandleAccelerators() const {
+  return true;
+}
+
+void ArcVoiceInteractionService::GetVoiceInteractionStructure(
+    const GetVoiceInteractionStructureCallback& callback) {
+  LOG(ERROR) << "ArcVoiceInteractionSerivce::GetVoiceInteractionStructure "
+             << "not implemented.";
+  // TODO(muyuanli): The logic below is only there to prevent blocking.
+  //                 details needs to be implemented in the future.
+  mojom::VoiceInteractionStructurePtr structure =
+      mojom::VoiceInteractionStructure::New();
+  structure->success = false;
+  callback.Run(std::move(structure));
+}
+
+void ArcVoiceInteractionService::CaptureFocusedWindow(
+    const CaptureFocusedWindowCallback& callback) {
+  LOG(ERROR)
+      << "ArcVoiceInteractionService::CaptureFocusedWindow not implemented.";
+  // TODO(muyuanli): The logic below is only there to prevent blocking.
+  //                 details needs to be implemented in the future.
+  std::vector<uint8_t> result;
+  callback.Run(result);
+}
+
+}  // namespace arc