[Android MR] Initial directory layout for CAF migration

This CL lies out the directory layout for CAF migration. The
migrated code will reside in caf/, in parallel of cast/. The
migrated code is guarded behind a feature flag.

Bug: 711860
Change-Id: Iddfe9e3ce3103fae876c9c151c96aba2ef99354f
Reviewed-on: https://chromium-review.googlesource.com/977232Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Zhiqiang Zhang <zqzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546175}

chrome/android/java/src/org/chromium/chrome/browser/ChromeFeatureList.java

@@ -153,6 +153,7 @@ public abstract class ChromeFeatureList {
     public static final String ANDROID_PAY_INTEGRATION_V2 = "AndroidPayIntegrationV2";
     public static final String ANDROID_PAYMENT_APPS = "AndroidPaymentApps";
     public static final String AUTOFILL_SCAN_CARDHOLDER_NAME = "AutofillScanCardholderName";
+    public static final String CAF_MEDIA_ROUTER_IMPL = "CafMediaRouterImpl";
     public static final String CAPTIVE_PORTAL_CERTIFICATE_LIST = "CaptivePortalCertificateList";
     public static final String CCT_BACKGROUND_TAB = "CCTBackgroundTab";
     public static final String CCT_EXTERNAL_LINK_HANDLING = "CCTExternalLinkHandling";

chrome/android/java/src/org/chromium/chrome/browser/media/router/ChromeMediaRouter.java

@@ -13,6 +13,8 @@ import org.chromium.base.SysUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.chrome.browser.ChromeFeatureList;
+import org.chromium.chrome.browser.media.router.caf.CafMediaRouteProvider;
 import org.chromium.chrome.browser.media.router.cast.CastMediaRouteProvider;
 import org.chromium.chrome.browser.media.router.cast.MediaSink;
 import org.chromium.chrome.browser.media.router.cast.MediaSource;
@@ -38,6 +40,14 @@ public class ChromeMediaRouter implements MediaRouteManager {
             new MediaRouteProvider.Factory() {
                 @Override
                 public void addProviders(MediaRouteManager manager) {
+                    // Bypass feature check in tests as ChromeFeatureList might not be initialized
+                    // yet.
+                    if (ChromeFeatureList.isInitialized()
+                            && ChromeFeatureList.isEnabled(
+                                       ChromeFeatureList.CAF_MEDIA_ROUTER_IMPL)) {
+                        MediaRouteProvider cafProvider = CafMediaRouteProvider.create(manager);
+                        manager.addMediaRouteProvider(cafProvider);
+                    } else {
                         MediaRouteProvider castProvider = CastMediaRouteProvider.create(manager);
                         manager.addMediaRouteProvider(castProvider);
 
@@ -45,6 +55,7 @@ public class ChromeMediaRouter implements MediaRouteManager {
                                 RemotingMediaRouteProvider.create(manager);
                         manager.addMediaRouteProvider(remotingProvider);
                     }
+                }
             };
 
     // The pointer to the native object. Can be null during tests, or when the

chrome/android/java/src/org/chromium/chrome/browser/media/router/caf/CafMediaRouteProvider.java

+// Copyright 2018 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.media.router.caf;
+
+import org.chromium.chrome.browser.media.router.MediaController;
+import org.chromium.chrome.browser.media.router.MediaRouteManager;
+import org.chromium.chrome.browser.media.router.MediaRouteProvider;
+
+import javax.annotation.Nullable;
+
+/**
+ * A {@link MediaRouteProvider} implementation for Cast devices and applications, using Cast v3 API.
+ */
+public class CafMediaRouteProvider implements MediaRouteProvider {
+    MediaRouteManager mManager;
+
+    private CafMediaRouteProvider(MediaRouteManager manager) {
+        mManager = manager;
+    }
+
+    public static CafMediaRouteProvider create(MediaRouteManager manager) {
+        return new CafMediaRouteProvider(manager);
+    }
+
+    @Override
+    public boolean supportsSource(String sourceId) {
+        // Not implemented.
+        return true;
+    }
+
+    @Override
+    public void startObservingMediaSinks(String sourceId) {
+        // Not implemented.
+    }
+
+    @Override
+    public void stopObservingMediaSinks(String sourceId) {
+        // Not implemented.
+    }
+
+    @Override
+    public void createRoute(String sourceId, String sinkId, String presentationId, String origin,
+            int tabId, boolean isIncognito, int nativeRequestId) {
+        // Not implemented.
+    }
+
+    @Override
+    public void joinRoute(
+            String sourceId, String presentationId, String origin, int tabId, int nativeRequestId) {
+        // Not implemented.
+    }
+
+    @Override
+    public void closeRoute(String routeId) {
+        // Not implemented.
+    }
+
+    @Override
+    public void detachRoute(String routeId) {
+        // Not implemented.
+    }
+
+    @Override
+    public void sendStringMessage(String routeId, String message, int nativeCallbackId) {
+        // Not implemented.
+    }
+
+    @Override
+    @Nullable
+    public MediaController getMediaController(String routeId) {
+        // Not implemented.
+        return null;
+    }
+}

chrome/android/java_sources.gni

@@ -621,6 +621,7 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/media/router/MediaRouteDialogManager.java",
   "java/src/org/chromium/chrome/browser/media/router/MediaRouteManager.java",
   "java/src/org/chromium/chrome/browser/media/router/MediaRouteProvider.java",
+  "java/src/org/chromium/chrome/browser/media/router/caf/CafMediaRouteProvider.java",
   "java/src/org/chromium/chrome/browser/media/router/cast/BaseMediaRouteProvider.java",
   "java/src/org/chromium/chrome/browser/media/router/cast/CastMediaRouteProvider.java",
   "java/src/org/chromium/chrome/browser/media/router/cast/CastMediaSource.java",

chrome/browser/android/chrome_feature_list.cc

@@ -26,6 +26,7 @@
 #include "components/subresource_filter/core/browser/subresource_filter_features.h"
 #include "content/public/common/content_features.h"
 #include "jni/ChromeFeatureList_jni.h"
+#include "media/base/media_switches.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
@@ -132,6 +133,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &payments::features::kWebPaymentsSingleAppUiSkip,
     &kWebVrAutopresentFromIntent,
     &kWebVrCardboardSupport,
+    &media::kCafMediaRouterImpl,
     &ntp_snippets::kArticleSuggestionsExpandableHeader,
     &ntp_snippets::kIncreasedVisibility,
     &ntp_snippets::kForeignSessionsSuggestionsFeature,

media/base/media_switches.cc

@@ -315,6 +315,10 @@ const base::Feature kVideoRotateToFullscreen{"VideoRotateToFullscreen",
 const base::Feature kMediaDrmPersistentLicense{
     "MediaDrmPersistentLicense", base::FEATURE_ENABLED_BY_DEFAULT};
 
+// Enables the Android MediaRouter implementation using CAF (Cast v3).
+const base::Feature kCafMediaRouterImpl{"CafMediaRouterImpl",
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
+
 #endif
 
 #if defined(OS_WIN)

media/base/media_switches.h

@@ -137,6 +137,7 @@ MEDIA_EXPORT extern const base::Feature kUseModernMediaControls;
 MEDIA_EXPORT extern const base::Feature kVideoFullscreenOrientationLock;
 MEDIA_EXPORT extern const base::Feature kVideoRotateToFullscreen;
 MEDIA_EXPORT extern const base::Feature kMediaDrmPersistentLicense;
+MEDIA_EXPORT extern const base::Feature kCafMediaRouterImpl;
 #endif  // defined(OS_ANDROID)
 
 #if defined(OS_WIN)