Cleanup: Sanitize the order of includes under tests/

tests/ShaderOpacityTest.cpp

Index: tests/ShaderOpacityTest.cpp
diff --git a/tests/ShaderOpacityTest.cpp b/tests/ShaderOpacityTest.cpp
index 3e67306332a9650d08cebf11b742b27b299a61a6..5230e4a0fadbfd75f81a34814642f51e694362b9 100644
--- a/tests/ShaderOpacityTest.cpp
+++ b/tests/ShaderOpacityTest.cpp
@@ -5,10 +5,10 @@
  * found in the LICENSE file.
  */
 
-#include "Test.h"
-#include "SkShader.h"
-#include "SkGradientShader.h"
 #include "SkColorShader.h"
+#include "SkGradientShader.h"
+#include "SkShader.h"
+#include "Test.h"
 
 static void test_bitmap(skiatest::Reporter* reporter) {
     SkBitmap bmp;