Merge java_staging/src into java/src.

chrome/android/java_staging/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
deleted file mode 100644
index 6f0849e5f66396ba37385db56bc193c2aaa2dd74..0000000000000000000000000000000000000000
--- a/chrome/android/java_staging/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ /dev/null
@@ -1,558 +0,0 @@
-// 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.customtabs;
-
-import android.annotation.SuppressLint;
-import android.app.ActivityManager;
-import android.app.Application;
-import android.content.ComponentName;
-import android.content.Context;
-import android.content.Intent;
-import android.content.ServiceConnection;
-import android.content.pm.PackageManager;
-import android.content.res.Resources;
-import android.graphics.Point;
-import android.net.ConnectivityManager;
-import android.net.Uri;
-import android.os.AsyncTask;
-import android.os.Binder;
-import android.os.Bundle;
-import android.os.IBinder;
-import android.os.Process;
-import android.os.RemoteException;
-import android.os.SystemClock;
-import android.text.TextUtils;
-import android.util.LongSparseArray;
-import android.util.SparseArray;
-import android.view.WindowManager;
-
-import org.chromium.base.FieldTrialList;
-import org.chromium.base.Log;
-import org.chromium.base.ThreadUtils;
-import org.chromium.base.VisibleForTesting;
-import org.chromium.base.annotations.SuppressFBWarnings;
-import org.chromium.base.library_loader.ProcessInitException;
-import org.chromium.base.metrics.RecordHistogram;
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ChromiumApplication;
-import org.chromium.chrome.browser.IntentHandler;
-import org.chromium.chrome.browser.WarmupManager;
-import org.chromium.chrome.browser.prerender.ExternalPrerenderHandler;
-import org.chromium.chrome.browser.profiles.Profile;
-import org.chromium.content.browser.ChildProcessLauncher;
-import org.chromium.content_public.browser.WebContents;
-
-import java.security.SecureRandom;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicBoolean;
-
-/**
- * Implementation of the ICustomTabsConnectionService interface.
- */
-class CustomTabsConnection extends ICustomTabsConnectionService.Stub {
-    private static final String TAG = "cr.ChromeConnection";
-    private static final long RESULT_OK = 0;
-    private static final long RESULT_ERROR = -1;
-
-    // Values for the "CustomTabs.PredictionStatus" UMA histogram. Append-only.
-    private static final int NO_PREDICTION = 0;
-    private static final int GOOD_PREDICTION = 1;
-    private static final int BAD_PREDICTION = 2;
-    private static final int PREDICTION_STATUS_COUNT = 3;
-
-    private static final Object sConstructionLock = new Object();
-    private static CustomTabsConnection sInstance;
-
-    private static final class PrerenderedUrlParams {
-        public final long mSessionId;
-        public final WebContents mWebContents;
-        public final String mUrl;
-        public final String mReferrer;
-        public final Bundle mExtras;
-
-        PrerenderedUrlParams(long sessionId, WebContents webContents, String url, String referrer,
-                Bundle extras) {
-            mSessionId = sessionId;
-            mWebContents = webContents;
-            mUrl = url;
-            mReferrer = referrer;
-            mExtras = extras;
-        }
-    }
-
-    private final Application mApplication;
-    private final AtomicBoolean mWarmupHasBeenCalled;
-    private ExternalPrerenderHandler mExternalPrerenderHandler;
-    private PrerenderedUrlParams mPrerender;
-
-    /** Per-sessionId values. */
-    private static class SessionParams {
-        public final int mUid;
-        private ServiceConnection mServiceConnection;
-        private String mPredictedUrl;
-        private long mLastMayLaunchUrlTimestamp;
-
-        public SessionParams(int uid) {
-            mUid = uid;
-            mServiceConnection = null;
-            mPredictedUrl = null;
-            mLastMayLaunchUrlTimestamp = 0;
-        }
-
-        public ServiceConnection getServiceConnection() {
-            return mServiceConnection;
-        }
-
-        public void setServiceConnection(ServiceConnection serviceConnection) {
-            mServiceConnection = serviceConnection;
-        }
-
-        public void setPredictionMetrics(String predictedUrl, long lastMayLaunchUrlTimestamp) {
-            mPredictedUrl = predictedUrl;
-            mLastMayLaunchUrlTimestamp = lastMayLaunchUrlTimestamp;
-        }
-
-        public String getPredictedUrl() {
-            return mPredictedUrl;
-        }
-
-        public long getLastMayLaunchUrlTimestamp() {
-            return mLastMayLaunchUrlTimestamp;
-        }
-    }
-
-    private final Object mLock;
-    private final SparseArray<ICustomTabsConnectionCallback> mUidToCallback;
-    private final LongSparseArray<SessionParams> mSessionParams;
-
-    private CustomTabsConnection(Application application) {
-        super();
-        mApplication = application;
-        mWarmupHasBeenCalled = new AtomicBoolean();
-        mLock = new Object();
-        mUidToCallback = new SparseArray<ICustomTabsConnectionCallback>();
-        mSessionParams = new LongSparseArray<SessionParams>();
-    }
-
-    /**
-     * @return The unique instance of ChromeCustomTabsConnection.
-     */
-    public static CustomTabsConnection getInstance(Application application) {
-        synchronized (sConstructionLock) {
-            if (sInstance == null) sInstance = new CustomTabsConnection(application);
-        }
-        return sInstance;
-    }
-
-    @Override
-    public long finishSetup(ICustomTabsConnectionCallback callback) {
-        if (callback == null) return RESULT_ERROR;
-        final int uid = Binder.getCallingUid();
-        synchronized (mLock) {
-            if (mUidToCallback.get(uid) != null) return RESULT_ERROR;
-            try {
-                callback.asBinder().linkToDeath(new IBinder.DeathRecipient() {
-                    @Override
-                    public void binderDied() {
-                        synchronized (mLock) {
-                            cleanupAlreadyLocked(uid);
-                        }
-                    }
-                }, 0);
-            } catch (RemoteException e) {
-                // The return code doesn't matter, because this executes when
-                // the caller has died.
-                return RESULT_ERROR;
-            }
-            mUidToCallback.put(uid, callback);
-        }
-        return RESULT_OK;
-    }
-
-    @Override
-    public long warmup(long flags) {
-        // Here and in mayLaunchUrl(), don't do expensive work for background applications.
-        if (!isUidForegroundOrSelf(Binder.getCallingUid())) return RESULT_ERROR;
-        if (!mWarmupHasBeenCalled.compareAndSet(false, true)) return RESULT_OK;
-        // The call is non-blocking and this must execute on the UI thread, post a task.
-        ThreadUtils.postOnUiThread(new Runnable() {
-            @Override
-            @SuppressFBWarnings("DM_EXIT")
-            public void run() {
-                try {
-                    // TODO(lizeb): Warm up more of the browser.
-                    ChromiumApplication app = (ChromiumApplication) mApplication;
-                    app.startBrowserProcessesAndLoadLibrariesSync(true);
-                    final Context context = app.getApplicationContext();
-                    new AsyncTask<Void, Void, Void>() {
-                        @Override
-                        protected Void doInBackground(Void... params) {
-                            ChildProcessLauncher.warmUp(context);
-                            return null;
-                        }
-                    }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
-                } catch (ProcessInitException e) {
-                    Log.e(TAG, "ProcessInitException while starting the browser process.");
-                    // Cannot do anything without the native library, and cannot show a
-                    // dialog to the user.
-                    System.exit(-1);
-                }
-            }
-        });
-        return RESULT_OK;
-    }
-
-    @Override
-    @SuppressLint("TrulyRandom") // TODO(lizeb): Figure out whether using SecureRandom is OK.
-    public long newSession() {
-        synchronized (mLock) {
-            long sessionId;
-            SecureRandom randomSource = new SecureRandom();
-            do {
-                sessionId = randomSource.nextLong();
-                // Because Math.abs(Long.MIN_VALUE) == Long.MIN_VALUE.
-                if (sessionId == Long.MIN_VALUE) continue;
-                sessionId = Math.abs(sessionId);
-            } while (sessionId == 0 || mSessionParams.get(sessionId) != null);
-            mSessionParams.put(sessionId, new SessionParams(Binder.getCallingUid()));
-            return sessionId;
-        }
-    }
-
-    @Override
-    public long mayLaunchUrl(final long sessionId, final String url, final Bundle extras,
-            List<Bundle> otherLikelyBundles) {
-        int uid = Binder.getCallingUid();
-        // Don't do anything for unknown schemes. Not having a scheme is
-        // allowed, as we allow "www.example.com".
-        String scheme = Uri.parse(url).normalizeScheme().getScheme();
-        if (scheme != null && !scheme.equals("http") && !scheme.equals("https")) {
-            return RESULT_ERROR;
-        }
-        if (!isUidForegroundOrSelf(uid)) return RESULT_ERROR;
-        synchronized (mLock) {
-            SessionParams sessionParams = mSessionParams.get(sessionId);
-            if (sessionParams == null || sessionParams.mUid != uid) return RESULT_ERROR;
-            sessionParams.setPredictionMetrics(url, SystemClock.elapsedRealtime());
-        }
-        ThreadUtils.postOnUiThread(new Runnable() {
-            @Override
-            public void run() {
-                if (!TextUtils.isEmpty(url)) {
-                    WarmupManager.getInstance().maybePrefetchDnsForUrlInBackground(
-                            mApplication.getApplicationContext(), url);
-                }
-                // Calling with a null or empty url cancels a current prerender.
-                prerenderUrl(sessionId, url, extras);
-            }
-        });
-        return sessionId;
-    }
-
-    /**
-     * Registers a launch of a |url| for a given |sessionId|.
-     *
-     * This is used for accounting.
-     */
-    void registerLaunch(long sessionId, String url) {
-        int outcome;
-        long elapsedTimeMs = -1;
-        synchronized (mLock) {
-            SessionParams sessionParams = mSessionParams.get(sessionId);
-            if (sessionParams == null) {
-                outcome = NO_PREDICTION;
-            } else {
-                String predictedUrl = sessionParams.getPredictedUrl();
-                outcome = predictedUrl == null ? NO_PREDICTION
-                        : predictedUrl.equals(url) ? GOOD_PREDICTION : BAD_PREDICTION;
-                elapsedTimeMs = SystemClock.elapsedRealtime()
-                        - sessionParams.getLastMayLaunchUrlTimestamp();
-                sessionParams.setPredictionMetrics(null, 0);
-            }
-        }
-        RecordHistogram.recordEnumeratedHistogram(
-                "CustomTabs.PredictionStatus", outcome, PREDICTION_STATUS_COUNT);
-        if (outcome == GOOD_PREDICTION) {
-            RecordHistogram.recordCustomTimesHistogram("CustomTabs.PredictionToLaunch",
-                    elapsedTimeMs, 1, TimeUnit.MINUTES.toMillis(3), TimeUnit.MILLISECONDS, 100);
-        }
-    }
-
-    /**
-     * Transfers a prerendered WebContents if one exists.
-     *
-     * This resets the internal WebContents; a subsequent call to this method
-     * returns null. Must be called from the UI thread.
-     * If a prerender exists for a different URL with the same sessionId or with
-     * a different referrer, then this is treated as a mispredict from the
-     * client application, and cancels the previous prerender. This is done to
-     * avoid keeping resources laying around for too long, but is subject to a
-     * race condition, as the following scenario is possible:
-     * The application calls:
-     * 1. mayLaunchUrl(url1) <- IPC
-     * 2. loadUrl(url2) <- Intent
-     * 3. mayLaunchUrl(url3) <- IPC
-     * If the IPC for url3 arrives before the intent for url2, then this methods
-     * cancels the prerender for url3, which is unexpected. On the other
-     * hand, not cancelling the previous prerender leads to wasted resources, as
-     * a WebContents is lingering. This can be solved by requiring applications
-     * to call mayLaunchUrl(null) to cancel a current prerender before 2, that
-     * is for a mispredict.
-     *
-     * @param sessionId The session ID, returned by {@link newSession}.
-     * @param url The URL the WebContents is for.
-     * @param referrer The referrer to use for |url|.
-     * @return The prerendered WebContents, or null.
-     */
-    WebContents takePrerenderedUrl(long sessionId, String url, String referrer) {
-        ThreadUtils.assertOnUiThread();
-        if (mPrerender == null || mPrerender.mSessionId != sessionId) return null;
-        WebContents webContents = mPrerender.mWebContents;
-        String prerenderedUrl = mPrerender.mUrl;
-        String prerenderReferrer = mPrerender.mReferrer;
-        if (referrer == null) referrer = "";
-        mPrerender = null;
-        if (TextUtils.equals(prerenderedUrl, url)
-                && TextUtils.equals(prerenderReferrer, referrer)) {
-            return webContents;
-        }
-        mExternalPrerenderHandler.cancelCurrentPrerender();
-        webContents.destroy();
-        return null;
-    }
-
-    private ICustomTabsConnectionCallback getCallbackForSessionIdAlreadyLocked(long sessionId) {
-        SessionParams sessionParams = mSessionParams.get(sessionId);
-        if (sessionParams == null) return null;
-        return mUidToCallback.get(sessionParams.mUid);
-    }
-
-    /**
-     * Notifies the application that a page load has started.
-     *
-     * Delivers the {@link ICustomTabsConnectionCallback#onUserNavigationStarted}
-     * callback to the aplication.
-     *
-     * @param sessionId The session ID.
-     * @param url The URL the tab is navigating to.
-     * @return true for success.
-     */
-    boolean notifyPageLoadStarted(long sessionId, String url) {
-        synchronized (mLock) {
-            ICustomTabsConnectionCallback cb = getCallbackForSessionIdAlreadyLocked(sessionId);
-            if (cb == null) return false;
-            try {
-                cb.onUserNavigationStarted(sessionId, url, null);
-            } catch (RemoteException e) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    /**
-     * Notifies the application that a page load has finished.
-     *
-     * Delivers the {@link ICustomTabsConnectionCallback#onUserNavigationFinished}
-     * callback to the aplication.
-     *
-     * @param sessionId The session ID.
-     * @param url The URL the tab has navigated to.
-     * @return true for success.
-     */
-    boolean notifyPageLoadFinished(long sessionId, String url) {
-        synchronized (mLock) {
-            ICustomTabsConnectionCallback cb = getCallbackForSessionIdAlreadyLocked(sessionId);
-            if (cb == null) return false;
-            try {
-                cb.onUserNavigationFinished(sessionId, url, null);
-            } catch (RemoteException e) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    /**
-     * Keeps the application linked with sessionId alive.
-     *
-     * The application is kept alive (that is, raised to at least the current
-     * process priority level) until {@link dontKeepAliveForSessionId()} is
-     * called.
-     *
-     * @param sessionId Session ID provided in the intent.
-     * @param intent Intent describing the service to bind to.
-     * @return true for success.
-     */
-    boolean keepAliveForSessionId(long sessionId, Intent intent) {
-        // When an application is bound to a service, its priority is raised to
-        // be at least equal to the application's one. This binds to a dummy
-        // service (no calls to this service are made).
-        if (intent == null || intent.getComponent() == null) return false;
-        SessionParams sessionParams;
-        synchronized (mLock) {
-            sessionParams = mSessionParams.get(sessionId);
-            if (sessionParams == null) return false;
-        }
-        String packageName = intent.getComponent().getPackageName();
-        PackageManager pm = mApplication.getApplicationContext().getPackageManager();
-        // Only binds to the application associated to this session ID.
-        int uid = sessionParams.mUid;
-        if (!Arrays.asList(pm.getPackagesForUid(uid)).contains(packageName)) return false;
-        Intent serviceIntent = new Intent().setComponent(intent.getComponent());
-        // This ServiceConnection doesn't handle disconnects. This is on
-        // purpose, as it occurs when the remote process has died. Since the
-        // only use of this connection is to keep the application alive,
-        // re-connecting would just re-create the process, but the application
-        // state has been lost at that point, the callbacks invalidated, etc.
-        ServiceConnection connection = new ServiceConnection() {
-            @Override
-            public void onServiceConnected(ComponentName name, IBinder service) {}
-            @Override
-            public void onServiceDisconnected(ComponentName name) {}
-        };
-        boolean ok;
-        try {
-            ok = mApplication.getApplicationContext().bindService(
-                    serviceIntent, connection, Context.BIND_AUTO_CREATE);
-        } catch (SecurityException e) {
-            return false;
-        }
-        if (ok) sessionParams.setServiceConnection(connection);
-        return ok;
-    }
-
-    /**
-     * Lets the lifetime of the process linked to a given sessionId be managed normally.
-     *
-     * Without a matching call to {@link keepAliveForSessionId}, this is a no-op.
-     *
-     * @param sessionId Session ID, as provided to {@link keepAliveForSessionId}.
-     */
-    void dontKeepAliveForSessionId(long sessionId) {
-        SessionParams sessionParams;
-        synchronized (mLock) {
-            sessionParams = mSessionParams.get(sessionId);
-        }
-        if (sessionParams == null || sessionParams.getServiceConnection() == null) return;
-        ServiceConnection serviceConnection = sessionParams.getServiceConnection();
-        sessionParams.setServiceConnection(null);
-        mApplication.getApplicationContext().unbindService(serviceConnection);
-    }
-
-    /**
-     * @return true if the |uid| is associated with a process having a
-     * foreground importance, or self.
-     */
-    private boolean isUidForegroundOrSelf(int uid) {
-        if (uid == Process.myUid()) return true;
-        ActivityManager am =
-                (ActivityManager) mApplication.getSystemService(Context.ACTIVITY_SERVICE);
-        List<ActivityManager.RunningAppProcessInfo> running = am.getRunningAppProcesses();
-        for (ActivityManager.RunningAppProcessInfo rpi : running) {
-            boolean isForeground =
-                    rpi.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND;
-            if (rpi.uid == uid && isForeground) return true;
-        }
-        return false;
-    }
-
-    /**
-     * {@link cleanupAlreadyLocked}, without holding mLock.
-     */
-    @VisibleForTesting
-    void cleanup(int uid) {
-        synchronized (mLock) {
-            cleanupAlreadyLocked(uid);
-        }
-    }
-
-    /**
-     * Called when a remote client has died.
-     */
-    private void cleanupAlreadyLocked(int uid) {
-        List<Long> keysToRemove = new ArrayList<Long>();
-        // TODO(lizeb): If iterating through all the session IDs is too costly,
-        // use two mappings.
-        for (int i = 0; i < mSessionParams.size(); i++) {
-            if (mSessionParams.valueAt(i).mUid == uid) keysToRemove.add(mSessionParams.keyAt(i));
-        }
-        for (Long sessionId : keysToRemove) {
-            mSessionParams.remove(sessionId);
-        }
-        mUidToCallback.remove(uid);
-    }
-
-    private boolean mayPrerender() {
-        if (FieldTrialList.findFullName("CustomTabs").equals("DisablePrerender")) return false;
-        ConnectivityManager cm =
-                (ConnectivityManager) mApplication.getApplicationContext().getSystemService(
-                        Context.CONNECTIVITY_SERVICE);
-        return !cm.isActiveNetworkMetered();
-    }
-
-    private void prerenderUrl(long sessionId, String url, Bundle extras) {
-        ThreadUtils.assertOnUiThread();
-        // TODO(lizeb): Prerendering through ChromePrerenderService is
-        // incompatible with prerendering through this service. Remove this
-        // limitation, or remove ChromePrerenderService.
-        WarmupManager.getInstance().disallowPrerendering();
-
-        if (!mayPrerender()) return;
-        if (!mWarmupHasBeenCalled.get()) return;
-        // Last one wins and cancels the previous prerender.
-        if (mPrerender != null) {
-            mExternalPrerenderHandler.cancelCurrentPrerender();
-            mPrerender.mWebContents.destroy();
-            mPrerender = null;
-        }
-        if (TextUtils.isEmpty(url)) return;
-        if (mExternalPrerenderHandler == null) {
-            mExternalPrerenderHandler = new ExternalPrerenderHandler();
-        }
-        Point contentSize = estimateContentSize();
-        String referrer = null;
-        if (extras != null) {
-            Intent extrasIntent = new Intent().putExtras(extras);
-            referrer = IntentHandler.getReferrerUrl(
-                    extrasIntent, mApplication.getApplicationContext());
-        }
-        if (referrer == null) referrer = "";
-        WebContents webContents = mExternalPrerenderHandler.addPrerender(
-                Profile.getLastUsedProfile(), url, referrer, contentSize.x, contentSize.y);
-        mPrerender = new PrerenderedUrlParams(sessionId, webContents, url, referrer, extras);
-    }
-
-    /**
-     * Provides an estimate of the contents size.
-     *
-     * The estimate is likely to be incorrect. This is not a problem, as the aim
-     * is to avoid getting a different layout and resources than needed at
-     * render time.
-     */
-    private Point estimateContentSize() {
-        // The size is estimated as:
-        // X = screenSizeX
-        // Y = screenSizeY - top bar - bottom bar - custom tabs bar
-        Point screenSize = new Point();
-        WindowManager wm = (WindowManager) mApplication.getSystemService(Context.WINDOW_SERVICE);
-        wm.getDefaultDisplay().getSize(screenSize);
-        Resources resources = mApplication.getResources();
-        int statusBarId = resources.getIdentifier("status_bar_height", "dimen", "android");
-        int navigationBarId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
-        try {
-            screenSize.y -=
-                    resources.getDimensionPixelSize(R.dimen.custom_tabs_control_container_height);
-            screenSize.y -= resources.getDimensionPixelSize(statusBarId);
-            screenSize.y -= resources.getDimensionPixelSize(navigationBarId);
-        } catch (Resources.NotFoundException e) {
-            // Nothing, this is just a best effort estimate.
-        }
-        return screenSize;
-    }
-}