Bug 1393359 - Register active user media on top level window. r=smaug,jib

dom/base/TimeoutManager.cpp

@@ -1258,8 +1258,7 @@ TimeoutManager::BudgetThrottlingEnabled(bool aIsBackground) const
   }
 
   // Check if we have active GetUserMedia
-  if (MediaManager::Exists() &&
+  if (mWindow.AsInner()->HasActiveUserMedia()) {
-      MediaManager::Get()->IsWindowStillActive(mWindow.WindowID())) {
     return false;
   }
 

dom/base/nsGlobalWindow.cpp

@@ -1039,7 +1039,8 @@ nsPIDOMWindow<T>::nsPIDOMWindow(nsPIDOMWindowOuter *aOuterWindow)
   mLargeAllocStatus(LargeAllocStatus::NONE),
   mHasTriedToCacheTopInnerWindow(false),
   mNumOfIndexedDBDatabases(0),
-  mNumOfOpenWebSockets(0)
+  mNumOfOpenWebSockets(0),
+  mNumOfActiveUserMedia(0)
 {
   if (aOuterWindow) {
     mTimeoutManager =
@@ -4524,6 +4525,30 @@ nsPIDOMWindowInner::HasOpenWebSockets() const
                           : mNumOfOpenWebSockets) > 0;
 }
 
+void
+nsPIDOMWindowInner::UpdateUserMediaCount(int32_t aDelta)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (aDelta == 0) {
+    return;
+  }
+
+  uint32_t& counter = mTopInnerWindow ? mTopInnerWindow->mNumOfActiveUserMedia
+                                      : mNumOfActiveUserMedia;
+
+  MOZ_DIAGNOSTIC_ASSERT(aDelta > 0 || ((aDelta + counter) < counter));
+
+  counter += aDelta;
+}
+
+bool
+nsPIDOMWindowInner::HasActiveUserMedia() const
+{
+  return (mTopInnerWindow ? mTopInnerWindow->mNumOfActiveUserMedia
+                          : mNumOfActiveUserMedia) > 0;
+}
+
 void
 nsPIDOMWindowOuter::MaybeActiveMediaComponents()
 {

dom/base/nsPIDOMWindow.h

@@ -751,6 +751,9 @@ protected:
 
   // The number of open WebSockets. Inner window only.
   uint32_t mNumOfOpenWebSockets;
+
+  // The number of active user media. Inner window only.
+  uint32_t mNumOfActiveUserMedia;
 };
 
 #define NS_PIDOMWINDOWINNER_IID \
@@ -936,6 +939,12 @@ public:
   // timeout-throttling.
   bool HasOpenWebSockets() const;
 
+  // Increase/Decrease the number of active user media.
+  void UpdateUserMediaCount(int32_t aDelta);
+
+  // Return true if there are any currently ongoing user media.
+  bool HasActiveUserMedia() const;
+
 protected:
   void CreatePerformanceObjectIfNeeded();
 };

dom/media/MediaManager.cpp

@@ -2926,6 +2926,12 @@ MediaManager::AddWindowID(uint64_t aWindowId,
     MOZ_ASSERT(false, "Window already added");
     return;
   }
+
+  auto* window = nsGlobalWindow::GetInnerWindowWithId(aWindowId);
+  if (window) {
+    window->AsInner()->UpdateUserMediaCount(1);
+  }
+
   GetActiveWindows()->Put(aWindowId, aListener);
 }
 
@@ -2941,6 +2947,8 @@ MediaManager::RemoveWindowID(uint64_t aWindowId)
     return;
   }
 
+  window->AsInner()->UpdateUserMediaCount(-1);
+
   nsPIDOMWindowOuter* outer = window->AsInner()->GetOuterWindow();
   if (!outer) {
     LOG(("No outer window for inner %" PRIu64, aWindowId));