Add a header file for TransitionView.cpp
committed from https://codereview.appspot.com/6492119/ for Thiago Farina <tfarina@chromium.org>

git-svn-id: http://skia.googlecode.com/svn/trunk@5552 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index f8f8111..cfdd4ae 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -37,6 +37,7 @@
 
 #include "SkGPipe.h"
 #include "SamplePipeControllers.h"
+#include "TransitionView.h"
 
 SK_DEFINE_INST_COUNT(SampleWindow::DeviceManager)
 
@@ -80,7 +81,6 @@
 
 extern SkView* create_overview(int, const SkViewFactory*[]);
 extern bool is_overview(SkView* view);
-extern SkView* create_transition(SkView*, SkView*, int);
 extern bool is_transition(SkView* view);