Bug 1390748 - Pre-declare MediaDecoder in HTMLMediaElement. r=jwwang

I noticed that touching MediaDecoder rebuilds a lot of seemingly unrelated
code. This is because HTMLMediaElement includes MediaDecoder.h, and
HTMLMediaElement is included in a number of places. Having HTMLMediaElement.h
predeclare rather than include fixes it.

MozReview-Commit-ID: I0vrPgqvvge

--HG--
extra : rebase_source : 505f9dce979aad0529b07d2c046dca5028af6de6

dom/base/nsContentUtils.cpp

@@ -22,7 +22,6 @@
 #include "jsfriendapi.h"
 #include "js/Value.h"
 #include "Layers.h"
-#include "MediaDecoder.h"
 #include "nsAppRunner.h"
 // nsNPAPIPluginInstance must be included before nsIDocument.h, which is included in mozAutoDocUpdate.h.
 #include "nsNPAPIPluginInstance.h"
@@ -48,7 +47,6 @@
 #include "mozilla/dom/FileSystemSecurity.h"
 #include "mozilla/dom/FileBlobImpl.h"
 #include "mozilla/dom/HTMLInputElement.h"
-#include "mozilla/dom/HTMLMediaElement.h"
 #include "mozilla/dom/HTMLTemplateElement.h"
 #include "mozilla/dom/HTMLContentElement.h"
 #include "mozilla/dom/HTMLShadowElement.h"

dom/html/HTMLMediaElement.cpp

@@ -7153,6 +7153,17 @@ HTMLMediaElement::NextFrameStatus()
   return NEXT_FRAME_UNINITIALIZED;
 }
 
+
+void
+HTMLMediaElement::SetDecoder(MediaDecoder* aDecoder)
+{
+  MOZ_ASSERT(aDecoder); // Use ShutdownDecoder() to clear.
+  if (mDecoder) {
+    ShutdownDecoder();
+  }
+  mDecoder = aDecoder;
+}
+
 float
 HTMLMediaElement::ComputedVolume() const
 {

dom/html/HTMLMediaElement.h

@@ -9,6 +9,8 @@
 #include "nsAutoPtr.h"
 #include "nsIDOMHTMLMediaElement.h"
 #include "nsGenericHTMLElement.h"
+#include "MediaEventSource.h"
+#include "SeekTarget.h"
 #include "MediaDecoderOwner.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsIObserver.h"
@@ -18,7 +20,6 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/dom/TextTrackManager.h"
 #include "mozilla/WeakPtr.h"
-#include "MediaDecoder.h"
 #include "mozilla/dom/MediaKeys.h"
 #include "mozilla/StateWatching.h"
 #include "nsGkAtoms.h"
@@ -49,6 +50,9 @@ class DOMMediaStream;
 class ErrorResult;
 class MediaResource;
 class MediaDecoder;
+class MediaInputPort;
+class MediaStream;
+class MediaStreamGraph;
 class VideoFrameContainer;
 namespace dom {
 class MediaKeys;
@@ -808,13 +812,7 @@ protected:
 
   MediaDecoderOwner::NextFrameStatus NextFrameStatus();
 
-  void SetDecoder(MediaDecoder* aDecoder) {
-    MOZ_ASSERT(aDecoder); // Use ShutdownDecoder() to clear.
-    if (mDecoder) {
-      ShutdownDecoder();
-    }
-    mDecoder = aDecoder;
-  }
+  void SetDecoder(MediaDecoder* aDecoder);
 
   class WakeLockBoolWrapper {
   public:

dom/html/HTMLVideoElement.h

@@ -11,6 +11,9 @@
 #include "mozilla/dom/HTMLMediaElement.h"
 
 namespace mozilla {
+
+class FrameStatistics;
+
 namespace dom {
 
 class WakeLock;

dom/media/MediaResource.cpp

@@ -33,6 +33,7 @@
 #include <algorithm>
 #include "nsProxyRelease.h"
 #include "nsIContentPolicy.h"
+#include "mozilla/ErrorNames.h"
 
 using mozilla::media::TimeUnit;