Enforce no uncleared OES external textures. Clear in AVDA, not GVD.

media/gpu/ipc/service/gpu_video_decode_accelerator.cc

Index: media/gpu/ipc/service/gpu_video_decode_accelerator.cc
diff --git a/media/gpu/ipc/service/gpu_video_decode_accelerator.cc b/media/gpu/ipc/service/gpu_video_decode_accelerator.cc
index 1470a1254cd4bf9c8357878c246c693058ca7704..bde28c65814402dd58ff11ed2ba78b08e9e8a30f 100644
--- a/media/gpu/ipc/service/gpu_video_decode_accelerator.cc
+++ b/media/gpu/ipc/service/gpu_video_decode_accelerator.cc
@@ -519,8 +519,14 @@ void GpuVideoDecodeAccelerator::SetTextureCleared(const Picture& picture) {
     GLenum target = texture_ref->texture()->target();
     gpu::gles2::TextureManager* texture_manager =
         stub_->decoder()->GetContextGroup()->texture_manager();
-    DCHECK(!texture_ref->texture()->IsLevelCleared(target, 0));
-    texture_manager->SetLevelCleared(texture_ref.get(), target, 0, true);
+
+    // OES textures are a special case and expected to already be cleared.

[sandersd (OOO until July 31), 2016/11/08 01:05:44]

Should say 'External textures are'.

[DaleCurtis, 2016/11/08 01:08:08]

Done.

+    if (target == GL_TEXTURE_EXTERNAL_OES) {
+      DCHECK(texture_ref->texture()->IsLevelCleared(target, 0));
+    } else {
+      DCHECK(!texture_ref->texture()->IsLevelCleared(target, 0));
+      texture_manager->SetLevelCleared(texture_ref.get(), target, 0, true);
+    }
   }
   uncleared_textures_.erase(it);
 }