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/TextureCache.cpp b/libs/hwui/TextureCache.cpp
index 3b8a9a4..0cd120a 100644
--- a/libs/hwui/TextureCache.cpp
+++ b/libs/hwui/TextureCache.cpp
@@ -24,6 +24,7 @@
 #include <utils/Mutex.h>
 
 #include "Caches.h"
+#include "Texture.h"
 #include "TextureCache.h"
 #include "Properties.h"