GN: add tests to DM

depends on https://codereview.chromium.org/2202203003 and https://codereview.chromium.org/2208433002

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2203143002

CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-GN-Trybot,Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-GN-Trybot,Test-Mac-Clang-MacMini6.2-CPU-AVX-x86_64-Debug-GN-Trybot,Test-Mac-Clang-MacMini6.2-CPU-AVX-x86_64-Release-GN-Trybot,Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Debug-GN-Trybot,Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Release-GN-Trybot

Review-Url: https://codereview.chromium.org/2203143002
diff --git a/tests/ImageTest.cpp b/tests/ImageTest.cpp
index 4f77fbd..671c479 100644
--- a/tests/ImageTest.cpp
+++ b/tests/ImageTest.cpp
@@ -8,7 +8,6 @@
 #include <functional>
 #include <initializer_list>
 #include <vector>
-#include "DMGpuSupport.h"
 
 #include "SkAutoPixmapStorage.h"
 #include "SkBitmap.h"
@@ -1001,11 +1000,11 @@
     auto img0 = SkImage::MakeFromBitmap(bm0);
     sk_sp<SkData> data(img0->encode(SkImageEncoder::kPNG_Type, 100));
     auto img1 = SkImage::MakeFromEncoded(data);
-    
+
     SkBitmap bm1;
     bm1.allocPixels(SkImageInfo::MakeN32(256, 256, kPremul_SkAlphaType));
     img1->readPixels(bm1.info(), bm1.getPixels(), bm1.rowBytes(), 0, 0);
-    
+
     REPORTER_ASSERT(reporter, equal(bm0, bm1));
 }