Fix a memory leak in MockDrmDevice::CreateDumbBuffer().

Bug: 855588
Change-Id: If19e6d5131fd60796ad524852b5a974e71d8dc4d
Reviewed-on: https://chromium-review.googlesource.com/1112041Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569652}

ui/ozone/platform/drm/gpu/mock_drm_device.cc

@@ -334,7 +334,10 @@ bool MockDrmDevice::CreateDumbBuffer(const SkImageInfo& info,
   *handle = allocate_buffer_count_++;
   *stride = info.minRowBytes();
   void* pixels = new char[info.computeByteSize(*stride)];
-  buffers_.push_back(SkSurface::MakeRasterDirect(info, pixels, *stride));
+  buffers_.push_back(SkSurface::MakeRasterDirectReleaseProc(
+      info, pixels, *stride,
+      [](void* pixels, void* context) { delete[] static_cast<char*>(pixels); },
+      /*context=*/nullptr));
   buffers_[*handle]->getCanvas()->clear(SK_ColorBLACK);
 
   return true;