AGSA-initiated weblite intents should be rewritten if Chrome can use weblite

When Chrome receives a navigation intent for a page on googleweblight.com,
Chrome should instead navigate to the url specified in the lite_url query
parameter if all of the following are true:

1) The URL specifies a lite_url parameter
2) Data-Saver is enabled in Chrome
3) the LoFi weblite experiment is enabled
4) the scheme of the url in the lite_url param is HTTP

BUG=584085

Review URL: https://codereview.chromium.org/1688603004

Cr-Commit-Position: refs/heads/master@{#378414}

11 files changed, 202 insertions, 18 deletions

diff --git a/chrome/android/java/src/org/chromium/chrome/browser/IntentHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/IntentHandler.java
index 0de17a9..74534b8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/IntentHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/IntentHandler.java
@@ -129,13 +129,13 @@ public class IntentHandler {
     private static Pair<Integer, String> sPendingReferrer;
     private static int sReferrerId;
 
+    public static final String PACKAGE_GSA = "com.google.android.googlequicksearchbox";
     private static final String PACKAGE_GMAIL = "com.google.android.gm";
     private static final String PACKAGE_PLUS = "com.google.android.apps.plus";
     private static final String PACKAGE_HANGOUTS = "com.google.android.talk";
     private static final String PACKAGE_MESSENGER = "com.google.android.apps.messaging";
     private static final String PACKAGE_LINE = "jp.naver.line.android";
     private static final String PACKAGE_WHATSAPP = "com.whatsapp";
-    private static final String PACKAGE_GSA = "com.google.android.googlequicksearchbox";
     private static final String FACEBOOK_LINK_PREFIX = "http://m.facebook.com/l.php?";
     private static final String TWITTER_LINK_PREFIX = "http://t.co/";
     private static final String NEWS_LINK_PREFIX = "http://news.google.com/news/url?";
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
index e331b7e..22a3e5b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
@@ -231,7 +231,7 @@ public class CustomTabActivity extends ChromeActivity {
 
     @Override
     public void finishNativeInitialization() {
-        CustomTabsConnection connection = CustomTabsConnection.getInstance(getApplication());
+        final CustomTabsConnection connection = CustomTabsConnection.getInstance(getApplication());
         // If extra headers have been passed, cancel any current prerender, as
         // prerendering doesn't support extra headers.
         if (IntentHandler.getExtraHeadersFromIntent(getIntent()) != null) {
@@ -274,6 +274,9 @@ public class CustomTabActivity extends ChromeActivity {
         mCustomTabContentHandler = new CustomTabContentHandler() {
             @Override
             public void loadUrlAndTrackFromTimestamp(LoadUrlParams params, long timestamp) {
+                if (params.getUrl() != null) {
+                    params.setUrl(connection.overrideUrlIfNecessary(params.getUrl(), mSession));
+                }
                 loadUrlInTab(getActivityTab(), params, timestamp);
             }
 
@@ -317,34 +320,35 @@ public class CustomTabActivity extends ChromeActivity {
                 return true;
             }
         };
-        DataUseTabUIManager.onCustomTabInitialNavigation(mMainTab,
-                connection.getClientPackageNameForSession(mSession),
-                IntentHandler.getUrlFromIntent(getIntent()));
+        String url = IntentHandler.getUrlFromIntent(getIntent());
+        if (url != null) url = connection.overrideUrlIfNecessary(url, mSession);
+        DataUseTabUIManager.onCustomTabInitialNavigation(
+                mMainTab, connection.getClientPackageNameForSession(mSession), url);
         recordClientPackageName();
         connection.showSignInToastIfNecessary(mSession, getIntent());
         if (mHasCreatedTabEarly) {
             if (!mMainTab.isLoading()) postDeferredStartupIfNeeded();
         } else {
-            loadUrlInTab(mMainTab, new LoadUrlParams(IntentHandler.getUrlFromIntent(getIntent())),
+            loadUrlInTab(mMainTab, new LoadUrlParams(url),
                     IntentHandler.getTimestampFromIntent(getIntent()));
         }
         super.finishNativeInitialization();
     }
 
     private Tab createMainTab() {
+        CustomTabsConnection customTabsConnection =
+                CustomTabsConnection.getInstance(getApplication());
         String url = IntentHandler.getUrlFromIntent(getIntent());
+        if (url != null) url = customTabsConnection.overrideUrlIfNecessary(url, mSession);
         // Get any referrer that has been explicitly set by the app.
         String referrerUrl = IntentHandler.getReferrerUrlIncludingExtraHeaders(getIntent(), this);
         if (referrerUrl == null) {
-            Referrer referrer = CustomTabsConnection.getInstance(getApplication())
-                    .getReferrerForSession(mSession);
+            Referrer referrer = customTabsConnection.getReferrerForSession(mSession);
             if (referrer != null) referrerUrl = referrer.getUrl();
         }
         Tab tab = new Tab(TabIdManager.getInstance().generateValidId(Tab.INVALID_TAB_ID),
                 Tab.INVALID_TAB_ID, false, this, getWindowAndroid(),
                 TabLaunchType.FROM_EXTERNAL_APP, null, null);
-        CustomTabsConnection customTabsConnection =
-                CustomTabsConnection.getInstance(getApplication());
         tab.setAppAssociatedWith(customTabsConnection.getClientPackageNameForSession(mSession));
         WebContents webContents =
                 customTabsConnection.takePrerenderedUrl(mSession, url, referrerUrl);
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
index 0b4e14d..5019973 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
@@ -373,6 +373,17 @@ public class CustomTabsConnection extends ICustomTabsService.Stub {
     }
 
     /**
+     * Returns the url to which the custom tab should navigate.
+     *
+     * @param url The original url.
+     * @param session The Binder object identifying a session.
+     * @return The url to be used. May be overriden.
+     */
+    public String overrideUrlIfNecessary(String url, IBinder session) {
+        return url;
+    }
+
+    /**
      * @return a spare WebContents, or null.
      *
      * This WebContents has already navigated to "about:blank". You have to call
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentActivity.java
index d928530..c11a722 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentActivity.java
@@ -41,6 +41,7 @@ import org.chromium.chrome.browser.firstrun.FirstRunSignInProcessor;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
 import org.chromium.chrome.browser.metrics.StartupMetrics;
 import org.chromium.chrome.browser.metrics.UmaUtils;
+import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
 import org.chromium.chrome.browser.ntp.NewTabPage;
 import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
@@ -585,6 +586,16 @@ public class DocumentActivity extends ChromeActivity {
             mTab = createActivityTab(asyncParams);
         }
 
+        if (!isIncognito() && asyncParams != null) {
+            LoadUrlParams loadUrlParams = asyncParams.getLoadUrlParams();
+            if (loadUrlParams != null && loadUrlParams.getUrl() != null) {
+                loadUrlParams.setUrl(DataReductionProxySettings.getInstance()
+                        .maybeRewriteWebliteUrl(loadUrlParams.getUrl()));
+            }
+        }
+
+        mTab = createActivityTab(asyncParams);
+
         if (asyncParams != null && asyncParams.getWebContents() != null) {
             Intent parentIntent = IntentUtils.safeGetParcelableExtra(getIntent(),
                     IntentHandler.EXTRA_PARENT_INTENT);
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/net/spdyproxy/DataReductionProxySettings.java b/chrome/android/java/src/org/chromium/chrome/browser/net/spdyproxy/DataReductionProxySettings.java
index 569eb7c..5ffe3fd9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/net/spdyproxy/DataReductionProxySettings.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/net/spdyproxy/DataReductionProxySettings.java
@@ -5,7 +5,10 @@
 package org.chromium.chrome.browser.net.spdyproxy;
 
 import android.content.Context;
+import android.net.Uri;
 import android.preference.PreferenceManager;
+import android.text.TextUtils;
+import android.webkit.URLUtil;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.VisibleForTesting;
@@ -55,6 +58,10 @@ public class DataReductionProxySettings {
 
     private static final String DATA_REDUCTION_ENABLED_PREF = "BANDWIDTH_REDUCTION_PROXY_ENABLED";
 
+    private static final String WEBLITE_HOSTNAME = "googleweblight.com";
+
+    private static final String WEBLITE_QUERY_PARAM = "lite_url";
+
     /**
      * Returns whether the data reduction proxy is enabled.
      *
@@ -269,6 +276,39 @@ public class DataReductionProxySettings {
         return map;
     }
 
+    /**
+     * If the given URL is a WebLite URL and should be overridden because the Data
+     * Reduction Proxy is on, the user is in the Lo-Fi previews experiment, and the scheme of the
+     * lite_url param is HTTP, returns the URL contained in the lite_url param. Otherwise returns
+     * the given URL.
+     *
+     * @param url The URL to evaluate.
+     * @return The URL to be used. Returns null if the URL param is null.
+     */
+    public String maybeRewriteWebliteUrl(String url) {
+        if (url == null || !URLUtil.isValidUrl(url) || !areLoFiPreviewsEnabled()
+                || !isDataReductionProxyEnabled()) {
+            return url;
+        }
+        String rewritten = extractUrlFromWebliteQueryParams(url);
+        if (rewritten == null
+                || !TextUtils.equals(Uri.parse(rewritten).getScheme(), "http")) {
+            return url;
+        }
+
+        return rewritten;
+    }
+
+    private String extractUrlFromWebliteQueryParams(String url) {
+        Uri uri = Uri.parse(url);
+        if (!TextUtils.equals(uri.getHost(), WEBLITE_HOSTNAME)) return null;
+        return uri.getQueryParameter(WEBLITE_QUERY_PARAM);
+    }
+
+    private boolean areLoFiPreviewsEnabled() {
+        return nativeAreLoFiPreviewsEnabled(mNativeDataReductionProxySettings);
+    }
+
     private native long nativeInit();
     private native boolean nativeIsDataReductionProxyAllowed(
             long nativeDataReductionProxySettingsAndroid);
@@ -304,6 +344,8 @@ public class DataReductionProxySettings {
             long nativeDataReductionProxySettingsAndroid);
     private native boolean nativeIsDataReductionProxyUnreachable(
             long nativeDataReductionProxySettingsAndroid);
+    private native boolean nativeAreLoFiPreviewsEnabled(
+            long nativeDataReductionProxySettingsAndroid);
     private native String nativeGetHttpProxyList(long nativeDataReductionProxySettingsAndroid);
     private native String nativeGetHttpsProxyList(long nativeDataReductionProxySettingsAndroid);
     private native String nativeGetLastBypassEvent(long nativeDataReductionProxySettingsAndroid);
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/ChromeTabCreator.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/ChromeTabCreator.java
index 2acbb9e..d476c3c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/ChromeTabCreator.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/ChromeTabCreator.java
@@ -13,6 +13,7 @@ import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.TabState;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabDelegateFactory;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
@@ -233,6 +234,13 @@ public class ChromeTabCreator extends TabCreatorManager.TabCreator {
             String appId, boolean forceNewTab, Intent intent, long intentTimestamp) {
         assert !mIncognito;
         boolean isLaunchedFromChrome = TextUtils.equals(appId, mActivity.getPackageName());
+
+        // If an external app sends an intent for a Weblite URL and the Data Reduction Proxy is
+        // using Weblite mode, then use the URL in the lite_url parameter if its scheme is HTTP.
+        // This is used by ChromeTabbedActvity intents so that the user does not receive Weblite
+        // pages when he or she could be served a Data Reduction Proxy preview page.
+        if (url != null) url = DataReductionProxySettings.getInstance().maybeRewriteWebliteUrl(url);
+
         if (forceNewTab && !isLaunchedFromChrome) {
             // We don't associate the tab with that app ID, as it is assumed that if the
             // application wanted to open this tab as a new tab, it probably does not want it
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/TabsOpenedFromExternalAppTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/TabsOpenedFromExternalAppTest.java
index 8e0ccfe..32cfec2 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/TabsOpenedFromExternalAppTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/TabsOpenedFromExternalAppTest.java
@@ -177,8 +177,8 @@ public class TabsOpenedFromExternalAppTest extends ChromeTabbedActivityTestBase
      * Returns when the URL has been navigated to.
      * @throws InterruptedException
      */
-    private void launchUrlFromExternalApp(String url, String appId, boolean createNewTab,
-            Bundle extras) throws InterruptedException {
+    private void launchUrlFromExternalApp(String url, String expectedUrl, String appId,
+            boolean createNewTab, Bundle extras) throws InterruptedException {
         final Intent intent = new Intent(Intent.ACTION_VIEW);
         if (appId != null) {
             intent.putExtra(Browser.EXTRA_APPLICATION_ID, appId);
@@ -204,12 +204,12 @@ public class TabsOpenedFromExternalAppTest extends ChromeTabbedActivityTestBase
                 }
             });
         }
-        ChromeTabUtils.waitForTabPageLoaded(getActivity().getActivityTab(), url);
+        ChromeTabUtils.waitForTabPageLoaded(getActivity().getActivityTab(), expectedUrl);
     }
 
     private void launchUrlFromExternalApp(String url, String appId, boolean createNewTab)
             throws InterruptedException {
-        launchUrlFromExternalApp(url, appId, createNewTab, null);
+        launchUrlFromExternalApp(url, url, appId, createNewTab, null);
     }
 
     /**
@@ -223,7 +223,7 @@ public class TabsOpenedFromExternalAppTest extends ChromeTabbedActivityTestBase
         startMainActivityFromLauncher();
         Bundle extras = new Bundle();
         extras.putParcelable(Intent.EXTRA_REFERRER, Uri.parse(ANDROID_APP_REFERRER));
-        launchUrlFromExternalApp(url, EXTERNAL_APP_1_ID, true, extras);
+        launchUrlFromExternalApp(url, url, EXTERNAL_APP_1_ID, true, extras);
         CriteriaHelper.pollForCriteria(
                 new ReferrerCriteria(getActivity().getActivityTab(), ANDROID_APP_REFERRER), 2000,
                 200);
@@ -241,7 +241,7 @@ public class TabsOpenedFromExternalAppTest extends ChromeTabbedActivityTestBase
         String referrer = "foobar://totally.legit.referrer";
         Bundle extras = new Bundle();
         extras.putParcelable(Intent.EXTRA_REFERRER, Uri.parse(referrer));
-        launchUrlFromExternalApp(url, EXTERNAL_APP_1_ID, true, extras);
+        launchUrlFromExternalApp(url, url, EXTERNAL_APP_1_ID, true, extras);
         CriteriaHelper.pollForCriteria(
                 new ReferrerCriteria(getActivity().getActivityTab(), ""), 2000, 200);
     }
@@ -632,4 +632,41 @@ public class TabsOpenedFromExternalAppTest extends ChromeTabbedActivityTestBase
             }
         });
     }
+
+    /**
+     * Tests that a Weblite url from an external app uses the lite_url param when Data Reduction
+     * Proxy previews are being used.
+     */
+    @MediumTest
+    @CommandLineFlags.Add({"enable-spdy-proxy-auth", "data-reduction-proxy-lo-fi=always-on",
+            "enable-data-reduction-proxy-lo-fi-preview"})
+    public void testLaunchWebLiteURL() throws InterruptedException {
+        startMainActivityFromLauncher();
+
+        String url = mTestServer.getURL("/chrome/test/data/android/about.html");
+
+        // Launch a first URL from an app.
+        launchUrlFromExternalApp("http://googleweblight.com/?lite_url=" + url, url,
+                EXTERNAL_APP_1_ID, false, null);
+
+        assertEquals("Selected tab is not on the right URL.",
+                url, getActivity().getActivityTab().getUrl());
+    }
+
+    /**
+     * Tests that a Weblite url from an external app does not use the lite_url param when Data
+     * Reduction Proxy previews are not being used.
+     */
+    @MediumTest
+    public void testLaunchWebLiteURLNoPreviews() throws InterruptedException {
+        startMainActivityFromLauncher();
+
+        String url = "http://googleweblight.com/?lite_url=chrome/test/data/android/about.html";
+
+        // Launch a first URL from an app.
+        launchUrlFromExternalApp(url, url, EXTERNAL_APP_1_ID, false, null);
+
+        assertEquals("Selected tab is not on the right URL.",
+                url, getActivity().getActivityTab().getUrl());
+    }
 }
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTest.java
index 67b96e3..1cee057 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTest.java
@@ -10,6 +10,7 @@ import android.app.PendingIntent;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Build;
+import android.os.Environment;
 import android.test.FlakyTest;
 import android.test.suitebuilder.annotation.MediumTest;
 import android.text.TextUtils;
@@ -17,6 +18,7 @@ import android.view.View;
 
 import org.chromium.base.ApplicationStatus;
 import org.chromium.base.ThreadUtils;
+import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.base.test.util.UrlUtils;
 import org.chromium.chrome.browser.ChromeActivity;
@@ -26,16 +28,19 @@ import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.ShortcutHelper;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.TabModel;
+import org.chromium.chrome.browser.tabmodel.TabModelSelector;
 import org.chromium.chrome.browser.tabmodel.TabModelUtils;
 import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelSelector;
 import org.chromium.chrome.browser.tabmodel.document.OffTheRecordDocumentTabModel;
 import org.chromium.chrome.test.util.ActivityUtils;
 import org.chromium.chrome.test.util.ApplicationTestUtils;
+import org.chromium.chrome.test.util.ChromeTabUtils;
 import org.chromium.chrome.test.util.DisableInTabbedMode;
 import org.chromium.content.browser.test.util.Criteria;
 import org.chromium.content.browser.test.util.CriteriaHelper;
 import org.chromium.content.browser.test.util.TouchCommon;
 import org.chromium.content_public.browser.LoadUrlParams;
+import org.chromium.net.test.EmbeddedTestServer;
 
 import java.lang.ref.WeakReference;
 import java.util.List;
@@ -650,6 +655,53 @@ public class DocumentModeTest extends DocumentModeTestBase {
                 "about:blank", IntentHandler.getUrlFromIntent(lastIntent));
     }
 
+    /**
+     * Tests that a Weblite url from an external app uses the lite_url param when Data Reduction
+     * Proxy previews are being used.
+     */
+    @MediumTest
+    @CommandLineFlags.Add({"enable-spdy-proxy-auth", "data-reduction-proxy-lo-fi=always-on",
+            "enable-data-reduction-proxy-lo-fi-preview"})
+    public void testLaunchWebLiteURL() throws Exception {
+        EmbeddedTestServer testServer;
+        testServer = EmbeddedTestServer.createAndStartFileServer(
+                getInstrumentation().getContext(), Environment.getExternalStorageDirectory());
+
+        String url = testServer.getURL("/chrome/test/data/android/about.html");
+        Runnable viewIntentRunnable = getViewIntentRunnable(false,
+                "http://googleweblight.com/?lite_url=" + url);
+
+        // Wait for the Activity to start up.
+        final DocumentActivity newActivity = ActivityUtils.waitForActivity(
+                getInstrumentation(), DocumentActivity.class, viewIntentRunnable);
+        ChromeTabUtils.waitForTabPageLoaded(newActivity.getActivityTab(), (String) null);
+
+        TabModelSelector selector = ChromeApplication.getDocumentTabModelSelector();
+        assertEquals(1, selector.getTotalTabCount());
+        assertEquals(url, selector.getModel(false).getTabAt(0).getUrl());
+
+        testServer.stopAndDestroyServer();
+    }
+
+    /**
+     * Tests that a Weblite url from an external app does not use the lite_url param when Data
+     * Reduction Proxy previews are not being used.
+     */
+    @MediumTest
+    public void testLaunchWebLiteURLNoPreviews() throws Exception {
+        String url = "http://googleweblight.com/?lite_url=chrome/test/data/android/about.html";
+        Runnable viewIntentRunnable = getViewIntentRunnable(false, url);
+
+        // Wait for the Activity to start up.
+        final DocumentActivity newActivity = ActivityUtils.waitForActivity(
+                getInstrumentation(), DocumentActivity.class, viewIntentRunnable);
+        ChromeTabUtils.waitForTabPageLoaded(newActivity.getActivityTab(), (String) null);
+
+        TabModelSelector selector = ChromeApplication.getDocumentTabModelSelector();
+        assertEquals(1, selector.getTotalTabCount());
+        assertEquals(url, selector.getModel(false).getTabAt(0).getUrl());
+    }
+
     private Intent performNewWindowTest(String url, String title, boolean checkWindowOpenSuccess,
             String openTitle, boolean waitLongerForOpenedPage) throws Exception {
         launchViaLaunchDocumentInstance(false, url, title);
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTestBase.java b/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTestBase.java
index 4187a70..db64de4 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTestBase.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/document/DocumentModeTestBase.java
@@ -83,7 +83,13 @@ public class DocumentModeTestBase extends MultiActivityTestBase {
     protected int launchViaViewIntent(final boolean incognito, final String url,
             final String expectedTitle) throws Exception {
         // Fire the Intent and wait until Chrome is in the foreground.
-        Runnable runnable = new Runnable() {
+        return launchUrlViaRunnable(
+                incognito, getViewIntentRunnable(incognito, url), expectedTitle, false);
+    }
+
+    /** Creates a runnable that starts a DocumentActivity by using firing a VIEW Intent. */
+    protected Runnable getViewIntentRunnable(final boolean incognito, final String url) {
+        return new Runnable() {
             @Override
             public void run() {
                 Runnable runnable = new Runnable() {
@@ -105,7 +111,6 @@ public class DocumentModeTestBase extends MultiActivityTestBase {
                         runnable);
             }
         };
-        return launchUrlViaRunnable(incognito, runnable, expectedTitle, false);
     }
 
     /** Starts a DocumentActivity using {@ref ChromeLauncherActivity.launchDocumentInstance().} */
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.cc b/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.cc
index 47940ae..514575c 100644
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.cc
+++ b/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.cc
@@ -17,6 +17,7 @@
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_event_store.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.h"
 #include "jni/DataReductionProxySettings_jni.h"
 #include "net/proxy/proxy_server.h"
@@ -154,6 +155,14 @@ jboolean DataReductionProxySettingsAndroid::IsDataReductionProxyUnreachable(
   return Settings()->IsDataReductionProxyUnreachable();
 }
 
+jboolean DataReductionProxySettingsAndroid::AreLoFiPreviewsEnabled(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  return data_reduction_proxy::params::IsIncludedInLoFiPreviewFieldTrial() ||
+      (data_reduction_proxy::params::IsLoFiOnViaFlags() &&
+          data_reduction_proxy::params::AreLoFiPreviewsEnabledViaFlags());
+}
+
 // static
 bool DataReductionProxySettingsAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
diff --git a/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.h b/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.h
index e4a6c6e..d351093 100644
--- a/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.h
+++ b/chrome/browser/net/spdyproxy/data_reduction_proxy_settings_android.h
@@ -96,6 +96,11 @@ class DataReductionProxySettingsAndroid {
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
 
+  // Return if Lo-Fi previews are enabled via a field trial or the command line.
+  jboolean AreLoFiPreviewsEnabled(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
+
   ScopedJavaLocalRef<jstring> GetTokenForAuthChallenge(JNIEnv* env,
                                                        jobject obj,
                                                        jstring host,