ui: Add support for creating GLImage instances from shared memory pools.

This adds an offset field to the GpuMemoryBufferHandle struct that
allows shared memory backed GLImages to be created from a pool of
shared memory. This is useful when importing buffers as it allows
the clients to manage the memory used for buffers.

BUG=538325
TEST=gl_unittests --gtest_filter=GLImageSharedMemoryPool/GLImageCopyTest/0.CopyTexImage
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1417363006

Cr-Commit-Position: refs/heads/master@{#356212}

2 files changed, 2 insertions, 1 deletions

diff --git a/cc/test/test_gpu_memory_buffer_manager.cc b/cc/test/test_gpu_memory_buffer_manager.cc
index 78fa6ad..a37ff93 100644
--- a/cc/test/test_gpu_memory_buffer_manager.cc
+++ b/cc/test/test_gpu_memory_buffer_manager.cc
@@ -56,6 +56,7 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
     gfx::GpuMemoryBufferHandle handle;
     handle.type = gfx::SHARED_MEMORY_BUFFER;
     handle.handle = shared_memory_->handle();
+    handle.offset = 0;
     return handle;
   }
   ClientBuffer AsClientBuffer() override {
diff --git a/cc/test/test_image_factory.cc b/cc/test/test_image_factory.cc
index aaf61ac..796b6d8 100644
--- a/cc/test/test_image_factory.cc
+++ b/cc/test/test_image_factory.cc
@@ -24,7 +24,7 @@ scoped_refptr<gfx::GLImage> TestImageFactory::CreateImageForGpuMemoryBuffer(
 
   scoped_refptr<gfx::GLImageSharedMemory> image(
       new gfx::GLImageSharedMemory(size, internalformat));
-  if (!image->Initialize(handle.handle, handle.id, format))
+  if (!image->Initialize(handle.handle, handle.id, format, handle.offset))
     return nullptr;
 
   return image;