[Android] Add workaround to unbind gpu memory buffer only on NVIDIA

For gralloc backed gpu memory buffer on Android, it is undefined whether
locking for read/write while the buffer is bound to a texture is
allowed.

On nvidia devices (eg 2012 nexus 7), lock without unbind will lead to
deadlocks in the driver (crbug.com/264096).

However on other nexus gpu vendors (img, arm, qualcomm), unbind is very
expensive since it flushes the gpu pipeline. And vendors have advised
that lock while bound is allowed and is the right solution to this
slowness, as long as the texture is eventually recycled or deleted.

Add a workaround for nvidia to only unbind in GLImage::DidUseTexImage.

BUG=

Review URL: https://codereview.chromium.org/66033009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234740 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 0 deletions

diff --git a/gpu/command_buffer/service/image_manager.h b/gpu/command_buffer/service/image_manager.h
index a125ae8..51e006d 100644
--- a/gpu/command_buffer/service/image_manager.h
+++ b/gpu/command_buffer/service/image_manager.h
@@ -37,6 +37,9 @@ class GPU_EXPORT ImageManager
   void RemoveImage(int32 service_id);
   gfx::GLImage* LookupImage(int32 service_id);
 
+  // For Android specific workaround.
+  void SetReleaseAfterUse();
+
  private:
   friend class base::RefCounted<ImageManager>;
 
@@ -44,6 +47,7 @@ class GPU_EXPORT ImageManager
 
   typedef base::hash_map<uint32, scoped_refptr<gfx::GLImage> > GLImageMap;
   GLImageMap gl_images_;
+  bool release_after_use_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageManager);
 };