Add dcastagna@ as owner of all GPU memory buffer related files.

BUG=
TEST=

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I90a5f6b6904547bb64ef72f01664e6807377870f
Reviewed-on: https://chromium-review.googlesource.com/1120351Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571536}

gpu/OWNERS

@@ -8,5 +8,6 @@ sunnyps@chromium.org
 
 # GPU memory buffer implementations.
 per-file *gpu_memory_buffer*=reveman@chromium.org
+per-file *gpu_memory_buffer*=dcastagna@chromium.org
 
 # COMPONENT: Internals>GPU>Internals

gpu/command_buffer/OWNERS

@@ -5,6 +5,6 @@ vmiura@chromium.org
 
 # GPU memory buffer tests.
 per-file *gpu_memory_buffer*=reveman@chromium.org
-
+per-file *gpu_memory_buffer*=dcastagna@chromium.org
 
 # COMPONENT: Internals>GPU>Internals

gpu/ipc/client/OWNERS

 # GPU memory buffer interface.
 per-file gpu_memory_buffer*=reveman@chromium.org
+per-file gpu_memory_buffer*=dcastagna@chromium.org
 
 # IOSurface usage.
 per-file *io_surface*=ccameron@chromium.org

gpu/perftests/OWNERS

-reveman@chromium.org
+dcastagna@chromium.org

ui/gfx/OWNERS

@@ -25,9 +25,13 @@ per-file skia_util*=danakj@chromium.org
 
 # GPU memory buffer and GpuFence interfaces.
 per-file gpu_fence*=reveman@chromium.org
+per-file gpu_fence*=dcastagna@chromium.org
 per-file gpu_memory_buffer*=reveman@chromium.org
+per-file gpu_memory_buffer*=dcastagna@chromium.org
 per-file buffer_format*=reveman@chromium.org
+per-file buffer_format*=dcastagna@chromium.org
 per-file *buffer_types.*=reveman@chromium.org
+per-file *buffer_types.*=dcastagna@chromium.org
 
 # Vector icons.
 per-file *vector_icon*=estade@chromium.org

ui/gl/OWNERS

 kbr@chromium.org
 piman@chromium.org
 per-file *gl_image*=reveman@chromium.org
+per-file *gl_image*=dcastagna@chromium.org
 per-file *_ozone*=alexst@chromium.org
 per-file *_ozone*=dnicoara@chromium.org
 per-file *_ozone*=spang@chromium.org

ui/gl/test/OWNERS

 per-file *gl_image*=reveman@chromium.org
+per-file *gl_image*=dcastagna@chromium.org