Add Vulkan support to GrAHardwareBufferImageGenerator

Bug: skia:
Change-Id: I37b08f336919fdac77fcd2726f129425bf8f4f2b
Reviewed-on: https://skia-review.googlesource.com/150132
Reviewed-by: Stan Iliev <stani@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tests/GrAHardwareBufferTest.cpp b/tests/GrAHardwareBufferTest.cpp
index 2c698cb..0feaacb 100644
--- a/tests/GrAHardwareBufferTest.cpp
+++ b/tests/GrAHardwareBufferTest.cpp
@@ -82,7 +82,10 @@
                 ERRORF(reporter, "Expected readback pixel (%d, %d) value 0x%08x, got 0x%08x.",
                        x, y,  srcPixel, dstPixel);
                 result = false;
-            }
+            }/* else {
+                SkDebugf("Got good pixel (%d, %d) value 0x%08x, got 0x%08x.\n",
+                       x, y,  srcPixel, dstPixel);
+            }*/
         }
     }
     return result;