Clean up physical coupling

Narrow the use of #include directives in hwui, replacing with forward
declarations where straightforward. Speeds compiles; doesn't do any
restructuring of code.

Change-Id: Icac2baffb5896f55d8c6718e9bd9d4bfa02d3ca0
diff --git a/libs/hwui/AnimatorManager.h b/libs/hwui/AnimatorManager.h
index d03d427..fb75eb8 100644
--- a/libs/hwui/AnimatorManager.h
+++ b/libs/hwui/AnimatorManager.h
@@ -21,7 +21,6 @@
 #include <cutils/compiler.h>
 #include <utils/StrongPointer.h>
 
-#include "TreeInfo.h"
 #include "utils/Macros.h"
 
 namespace android {
@@ -30,6 +29,7 @@
 class AnimationHandle;
 class BaseRenderNodeAnimator;
 class RenderNode;
+class TreeInfo;
 
 // Responsible for managing the animators for a single RenderNode
 class AnimatorManager {