Initial implementation of API WakeLock.

content/browser/wake_lock/lock.cc

+// Copyright (c) 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.
+
+#include "content/browser/wake_lock/lock.h"
+
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/browser/web_contents/web_contents_view_guest.h"
+#include "content/public/browser/power_save_blocker.h"
+#include "content/public/browser/render_view_host.h"
+
+namespace content {
+
+Lock::Lock(int render_process_id, int routed_id)
+    : render_process_id_(render_process_id),
+      routed_id_(routed_id),
+      unlocked_force_(false) {
+  LockResource();
+}
+
+Lock::~Lock() {
+  UnlockResource();
+}
+
+void Lock::LockResource() {
+  if (blocker_.get())
+    return;
+
+  blocker_ = PowerSaveBlocker::Create(
+      PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep, "WakeLock API");
+#if defined(OS_ANDROID)
+  const RenderViewHost* rvh = RenderViewHost::FromID(
+      render_process_id_, routed_id_);
+  WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
+  if (WebContentsImpl* web_contents_impl =
+      static_cast<WebContentsImpl*>(web_contents)) {
+    PowerSaveBlockerImpl* blocker =
+        static_cast<PowerSaveBlockerImpl*>(blocker_.get());
+    blocker->InitDisplaySleepBlocker(
+        web_contents_impl->GetView()->GetNativeView());
+  }
+#endif
+}
+
+void Lock::UnlockResource() {
+  if (blocker_.get())
+    blocker_.reset();
+}
+
+void Lock::ForceLockResource() {
+  if (unlocked_force_ == true)
+    LockResource();
+  unlocked_force_ = false;
+}
+
+void Lock::ForceUnlockResource() {
+  if (unlocked_force_ == false)
+    UnlockResource();
+  unlocked_force_ = true;
+}
+}