Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/prerender/ChromePrerenderService.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/prerender/ChromePrerenderService.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/prerender/ChromePrerenderService.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/prerender/ChromePrerenderService.java
new file mode 100644
index 0000000000000000000000000000000000000000..3254f11571b802c2d3af4092d1a54e93fad5e8d0
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@@ -0,0 +1,133 @@
+// 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.
+
+package org.chromium.chrome.browser.prerender;
+
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.IBinder;
+import android.os.Message;
+import android.os.Messenger;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.annotations.SuppressFBWarnings;
+import org.chromium.base.library_loader.ProcessInitException;
+import org.chromium.chrome.browser.ApplicationInitialization;
+import org.chromium.chrome.browser.ChromeVersionInfo;
+import org.chromium.chrome.browser.ChromiumApplication;
+import org.chromium.chrome.browser.WarmupManager;
+import org.chromium.chrome.browser.externalauth.ExternalAuthUtils;
+import org.chromium.chrome.browser.externalauth.VerifiedHandler;
+import org.chromium.content.browser.ChildProcessLauncher;
+
+/**
+ * A bound service that warms up Chrome and performs actions related with prerendering urls.
+ */
+public class ChromePrerenderService extends Service {
+    public static final int MSG_PRERENDER_URL = 1;
+    public static final int MSG_CANCEL_PRERENDER = 2;
+    public static final String KEY_PRERENDERED_URL = "url_to_prerender";
+    public static final String KEY_PRERENDER_WIDTH = "prerender_width";
+    public static final String KEY_PRERENDER_HEIGHT = "prerender_height";
+    public static final String KEY_REFERRER = "referrer";
+
+    private static class LauncherWarmUpTask extends AsyncTask<Context, Void, Void> {
+        @Override
+        protected Void doInBackground(Context... args) {
+            ChildProcessLauncher.warmUp(args[0]);
+            return null;
+        }
+    }
+
+    /**
+     * Handler of incoming messages from clients.
+     */
+    class IncomingHandler extends VerifiedHandler {
+        IncomingHandler(Context context) {
+            super(context, ChromeVersionInfo.isLocalBuild()
+                    ? 0 : ExternalAuthUtils.FLAG_SHOULD_BE_GOOGLE_SIGNED);
+        }
+
+        @Override
+        public void handleMessage(Message msg) {
+            ChromePrerenderService.this.handleMessage(msg);
+        }
+    }
+
+    /**
+     * Target we publish for clients to send messages to IncomingHandler.
+     */
+    private Messenger mMessenger;
+
+    /**
+     * When binding to the service, we return an interface to our messenger
+     * for sending messages to the service.
+     */
+    @SuppressFBWarnings("DM_EXIT")
+    @Override
+    public IBinder onBind(Intent intent) {
+        mMessenger = new Messenger(new IncomingHandler(getApplicationContext()));
+
+        try {
+            new LauncherWarmUpTask().execute(getApplicationContext());
+            ((ChromiumApplication) getApplication())
+                    .startBrowserProcessesAndLoadLibrariesSync(getApplicationContext(), true);
+
+            ApplicationInitialization.enableFullscreenFlags(
+                    getApplicationContext().getResources(),
+                    getApplicationContext(), R.dimen.control_container_height);
+        } catch (ProcessInitException e) {
+            Log.e(this.getClass().toString(),
+                    "ProcessInitException while starting the browser process");
+            // Since the library failed to initialize nothing in the application
+            // can work, so kill the whole application not just the activity
+            System.exit(-1);
+        }
+        return mMessenger.getBinder();
+    }
+
+    /**
+     * Handle and incoming message from the messenger. Child classes adding new messages
+     * should extend this call and handle them separately.
+     * @param msg The message to be handled.
+     */
+    protected void handleMessage(Message msg) {
+        switch (msg.what) {
+            case MSG_PRERENDER_URL:
+                final String url = msg.getData().getString(KEY_PRERENDERED_URL);
+                final String referrer = msg.getData().getString(KEY_REFERRER, "");
+                final int width = msg.getData().getInt(KEY_PRERENDER_WIDTH, 0);
+                final int height = msg.getData().getInt(KEY_PRERENDER_HEIGHT, 0);
+                if (!TextUtils.isEmpty(url)) {
+                    ThreadUtils.runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            prerenderUrl(url, referrer, width, height);
+                        }
+                    });
+                }
+                break;
+            case MSG_CANCEL_PRERENDER:
+                ThreadUtils.runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        WarmupManager.getInstance().cancelCurrentPrerender();
+                    }
+                });
+                break;
+            default:
+                break;
+        }
+    }
+
+    private void prerenderUrl(String url, String referrer, int width, int height) {
+        WarmupManager.getInstance().prerenderUrl(url, referrer, width, height);
+    }
+}