Revert of Move content/browser/power_save_blocker to //device/power_save_blocker

content/public/android/java/src/org/chromium/content/browser/PowerSaveBlocker.java

Index: content/public/android/java/src/org/chromium/content/browser/PowerSaveBlocker.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/PowerSaveBlocker.java b/content/public/android/java/src/org/chromium/content/browser/PowerSaveBlocker.java
new file mode 100644
index 0000000000000000000000000000000000000000..915d668da16f01c7d09df3a7cc9c3c323a99434f
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/PowerSaveBlocker.java
@@ -0,0 +1,46 @@
+// Copyright 2013 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.
+
+package org.chromium.content.browser;
+
+import android.view.View;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.ui.base.ViewAndroidDelegate;
+
+import java.lang.ref.WeakReference;
+
+@JNINamespace("content")
+class PowerSaveBlocker {
+    // WeakReference to prevent leaks in Android WebView.
+    private WeakReference<View> mKeepScreenOnView;
+
+    @CalledByNative
+    private static PowerSaveBlocker create() {
+        return new PowerSaveBlocker();
+    }
+
+    private PowerSaveBlocker() {}
+
+    @CalledByNative
+    private void applyBlock(ViewAndroidDelegate delegate) {
+        assert mKeepScreenOnView == null;
+        View anchorView = delegate.acquireAnchorView();
+        mKeepScreenOnView = new WeakReference<>(anchorView);
+        delegate.setAnchorViewPosition(anchorView, 0, 0, 0, 0);
+        anchorView.setKeepScreenOn(true);
+    }
+
+    @CalledByNative
+    private void removeBlock(ViewAndroidDelegate delegate) {
+        assert mKeepScreenOnView != null;
+        View anchorView = mKeepScreenOnView.get();
+        mKeepScreenOnView = null;
+        if (anchorView == null) return;
+
+        anchorView.setKeepScreenOn(false);
+        delegate.releaseAnchorView(anchorView);
+    }
+}