IWYU for some more test files starting with 'C'.

Change-Id: I010527b342cbfa0b425ef0d00966219413d9e77d
Reviewed-on: https://skia-review.googlesource.com/121886
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/tests/ColorPrivTest.cpp b/tests/ColorPrivTest.cpp
index d2045e8..c43873b 100644
--- a/tests/ColorPrivTest.cpp
+++ b/tests/ColorPrivTest.cpp
@@ -5,9 +5,11 @@
  * found in the LICENSE file.
  */
 
-#include "Test.h"
-
+#include "SkColor.h"
 #include "SkColorData.h"
+#include "SkColorPriv.h"
+#include "SkTypes.h"
+#include "Test.h"
 
 #define ASSERT(expr) REPORTER_ASSERT(r, expr)