Reland of Wake Lock API implementation (Chromium part)

content/browser/wake_lock/wake_lock_service_context.cc

+// Copyright 2015 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 "content/browser/wake_lock/wake_lock_service_context.h"
+
+#include "base/bind.h"
+#include "content/browser/power_save_blocker_impl.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/power_save_blocker.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/common/service_registry.h"
+
+namespace content {
+
+WakeLockServiceContext::WakeLockServiceContext(WebContents* web_contents)
+    : WebContentsObserver(web_contents), weak_factory_(this) {}
+
+WakeLockServiceContext::~WakeLockServiceContext() {}
+
+void WakeLockServiceContext::CreateService(
+    int render_process_id,
+    int render_frame_id,
+    mojo::InterfaceRequest<WakeLockService> request) {
+  new WakeLockServiceImpl(weak_factory_.GetWeakPtr(), render_process_id,
+                          render_frame_id, request.Pass());
+}
+
+void WakeLockServiceContext::RenderFrameDeleted(
+    RenderFrameHost* render_frame_host) {
+  CancelWakeLock(render_frame_host->GetProcess()->GetID(),
+                 render_frame_host->GetRoutingID());
+}
+
+void WakeLockServiceContext::RequestWakeLock(int render_process_id,
+                                             int render_frame_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (!RenderFrameHost::FromID(render_process_id, render_frame_id))
+    return;
+
+  frames_requesting_lock_.insert(
+      std::pair<int, int>(render_process_id, render_frame_id));
+  UpdateWakeLock();
+}
+
+void WakeLockServiceContext::CancelWakeLock(int render_process_id,
+                                            int render_frame_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  frames_requesting_lock_.erase(
+      std::pair<int, int>(render_process_id, render_frame_id));
+  UpdateWakeLock();
+}
+
+bool WakeLockServiceContext::HasWakeLockForTests() const {
+  return wake_lock_;
+}
+
+void WakeLockServiceContext::CreateWakeLock() {
+  DCHECK(!wake_lock_);
+  wake_lock_ = PowerSaveBlocker::Create(
+      PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
+      PowerSaveBlocker::kReasonOther, "Wake Lock API");
+
+#if defined(OS_ANDROID)
+  // On Android, additionaly associate the blocker with this WebContents.
+  DCHECK(web_contents());
+
+  static_cast<PowerSaveBlockerImpl*>(wake_lock_.get())
+      ->InitDisplaySleepBlocker(web_contents());
+#endif
+}
+
+void WakeLockServiceContext::RemoveWakeLock() {
+  DCHECK(wake_lock_);
+  wake_lock_.reset();
+}
+
+void WakeLockServiceContext::UpdateWakeLock() {
+  if (!frames_requesting_lock_.empty()) {
+    if (!wake_lock_)
+      CreateWakeLock();
+  } else {
+    if (wake_lock_)
+      RemoveWakeLock();
+  }
+}
+
+}  // namespace content