Move VertexAttribute to its own header file.

This is in preparation for VAO support.

TRAC #23390

Signed-off-by: Shannon Woods
Signed-off-by: Geoff Lang
Authored-by: Jamie Madill
diff --git a/src/libGLESv2/renderer/InputLayoutCache.cpp b/src/libGLESv2/renderer/InputLayoutCache.cpp
index 1c76ec8..a9d4857 100644
--- a/src/libGLESv2/renderer/InputLayoutCache.cpp
+++ b/src/libGLESv2/renderer/InputLayoutCache.cpp
@@ -13,7 +13,7 @@
 #include "libGLESv2/renderer/BufferStorage11.h"
 #include "libGLESv2/renderer/ShaderExecutable11.h"
 #include "libGLESv2/ProgramBinary.h"
-#include "libGLESv2/Context.h"
+#include "libGLESv2/VertexAttribute.h"
 #include "libGLESv2/renderer/VertexDataManager.h"
 
 #include "third_party/murmurhash/MurmurHash3.h"