VR: Update UiSceneManager with screen capturing flag

chrome/browser/android/vr_shell/vr_shell.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 
 #include <android/native_window_jni.h>
 
 #include <string>
 #include <utility>
@@ skipping 631 matching lines @@
     // Because a WebContents can only have one current RVH at a time, there will
     // be no duplicate WebContents here.
     if (indicator->IsCapturingAudio(web_contents))
       num_tabs_capturing_audio++;
     if (indicator->IsCapturingVideo(web_contents))
       num_tabs_capturing_video++;
     if (indicator->IsBeingMirrored(web_contents))
       num_tabs_capturing_screen++;
   }
 
-  ui_->SetAudioCapturingIndicator(num_tabs_capturing_audio > 0);
-  ui_->SetVideoCapturingIndicator(num_tabs_capturing_video > 0);
-  ui_->SetScreenCapturingIndicator(num_tabs_capturing_screen > 0);
+  bool is_capturing_audio = num_tabs_capturing_audio > 0;
+  bool is_capturing_video = num_tabs_capturing_video > 0;
+  bool is_capturing_screen = num_tabs_capturing_screen > 0;
+  if (is_capturing_audio != is_capturing_audio_) {
+    ui_->SetAudioCapturingIndicator(is_capturing_audio);
+    is_capturing_audio_ = is_capturing_audio;
+  }
+  if (is_capturing_video != is_capturing_video_) {
+    ui_->SetVideoCapturingIndicator(is_capturing_video);
+    is_capturing_video_ = is_capturing_video;
+  }
+  if (is_capturing_screen != is_capturing_screen_) {
+    ui_->SetScreenCapturingIndicator(is_capturing_screen);
+    is_capturing_screen_ = is_capturing_screen;
+  }
 }
 
 void VrShell::SetContentCssSize(float width, float height, float dpr) {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_VrShellImpl_setContentCssSize(env, j_vr_shell_.obj(), width, height,
                                      dpr);
 }
 
 void VrShell::ProcessContentGesture(
     std::unique_ptr<blink::WebInputEvent> event) {
@@ skipping 50 matching lines @@
            jlong gvr_api,
            jboolean reprojected_rendering) {
   return reinterpret_cast<intptr_t>(new VrShell(
       env, obj, reinterpret_cast<ui::WindowAndroid*>(window_android),
       for_web_vr, in_cct,
       VrShellDelegate::GetNativeVrShellDelegate(env, delegate),
       reinterpret_cast<gvr_context*>(gvr_api), reprojected_rendering));
 }
 
 }  // namespace vr_shell