Bug 1590639 part 3: Fix non-unified build issues in layout/{forms,painting}. r=TYLin

This patch:

- Gives nsMeterFrame.cpp a "using" decl for mozilla::dom::Document (matching
  local style), to make its "nsCOMPtr<Document>" variable valid.
- Gives RetainedDisplayListBuilder.cpp an include for nsIFrameInlines.h
  (and nsIFrame.h for good measure) to provide the definition for inline
  function nsIFrame::IsFixedPosContainingBlock().
- Gives nsDisplayList.cpp an include for LayerAnimationInfo.h, since it uses
  that type.

Depends on D50164

Differential Revision: https://phabricator.services.mozilla.com/D50165

--HG--
extra : moz-landing-system : lando

layout/forms/nsMeterFrame.cpp

@@ -23,6 +23,7 @@
 #include <algorithm>
 
 using namespace mozilla;
+using mozilla::dom::Document;
 using mozilla::dom::Element;
 using mozilla::dom::HTMLMeterElement;
 

layout/painting/RetainedDisplayListBuilder.cpp

@@ -9,6 +9,8 @@
 
 #include "DisplayListChecker.h"
 #include "mozilla/StaticPrefs_layout.h"
+#include "nsIFrame.h"
+#include "nsIFrameInlines.h"
 #include "nsPlaceholderFrame.h"
 #include "nsSubDocumentFrame.h"
 #include "nsViewManager.h"

layout/painting/nsDisplayList.cpp

@@ -87,6 +87,7 @@
 #include "ActiveLayerTracker.h"
 #include "nsPrintfCString.h"
 #include "UnitTransforms.h"
+#include "LayerAnimationInfo.h"
 #include "LayersLogging.h"
 #include "FrameLayerBuilder.h"
 #include "mozilla/EventStateManager.h"