Android: Strip some unused mediarouter classes via -assumevalues

Bug: 1000382
Change-Id: I5af4f79b7092c1ad9e459f4f2401e19e08139288
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797174
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695795}

chrome/android/java/monochrome_public_bundle.proguard_flags.expected

@@ -362,6 +362,28 @@
   *** build() return null;
 }
 
+################################################################################
+# ../../third_party/android_deps/support_mediarouter.flags
+################################################################################
+# Copyright 2019 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.
+
+# Help R8 to remove debug related coded. All of these static constants are
+# initialized to: Log.isLoggable(DEBUG, TAG).
+
+-assumevalues class android.support.v7.app.MediaRouteControllerDialogFragment {
+  static boolean USE_SUPPORT_DYNAMIC_GROUP return false;
+}
+
+-assumevalues class android.support.v7.media.MediaRouter {
+  static boolean DEBUG return false;
+}
+
+-assumevalues class android.support.v7.media.RegisteredMediaRouteProvider {
+  static boolean DEBUG return false;
+}
+
 ################################################################################
 # ../../third_party/feed/src/src/main/java/com/google/android/libraries/feed/buildtools/proguard/r8_release.flags
 ################################################################################

third_party/android_deps/BUILD.gn

@@ -364,6 +364,9 @@ android_aar_prebuilt("androidx_mediarouter_mediarouter_java") {
     ":androidx_palette_palette_java",
     ":androidx_recyclerview_recyclerview_java",
   ]
+
+  # https://crbug.com/1000382
+  proguard_configs = [ "androidx_mediarouter.flags" ]
 }
 
 # This is generated, do not edit. Update BuildConfigGenerator.groovy instead.
@@ -618,6 +621,9 @@ android_aar_prebuilt("com_android_support_mediarouter_v7_java") {
     ":com_android_support_recyclerview_v7_java",
     ":com_android_support_support_media_compat_java",
   ]
+
+  # https://crbug.com/1000382
+  proguard_configs = [ "support_mediarouter.flags" ]
 }
 
 # This is generated, do not edit. Update BuildConfigGenerator.groovy instead.

third_party/android_deps/androidx_mediarouter.flags

+# Copyright 2019 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.
+
+# Help R8 to remove debug related coded. All of these static constants are
+# initialized to: Log.isLoggable(DEBUG, TAG).
+
+-assumevalues class androidx.mediarouter.** {
+  static boolean DEBUG return false;
+}

third_party/android_deps/support_mediarouter.flags

+# Copyright 2019 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.
+
+# Help R8 to remove debug related coded. All of these static constants are
+# initialized to: Log.isLoggable(DEBUG, TAG).
+
+-assumevalues class android.support.v7.app.MediaRouteControllerDialogFragment {
+  static boolean USE_SUPPORT_DYNAMIC_GROUP return false;
+}
+
+-assumevalues class android.support.v7.media.MediaRouter {
+  static boolean DEBUG return false;
+}
+
+-assumevalues class android.support.v7.media.RegisteredMediaRouteProvider {
+  static boolean DEBUG return false;
+}

tools/android/roll/android_deps/buildSrc/src/main/groovy/BuildConfigGenerator.groovy

@@ -250,6 +250,14 @@ class BuildConfigGenerator extends DefaultTask {
                 // Target has AIDL, but we don't support it yet: http://crbug.com/644439
                 sb.append('  ignore_aidl = true\n')
                 break
+            case 'com_android_support_mediarouter_v7':
+                sb.append('  # https://crbug.com/1000382\n')
+                sb.append('  proguard_configs = ["support_mediarouter.flags"]\n')
+                break
+            case 'androidx_mediarouter_mediarouter':
+                sb.append('  # https://crbug.com/1000382\n')
+                sb.append('  proguard_configs = ["androidx_mediarouter.flags"]\n')
+                break
             case 'androidx_transition_transition':
                 // Not specified in the POM, compileOnly dependency not supposed to be used unless
                 // the library is present: b/70887421