During image destroy, delete textures only if we have a GL context.

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index 189215122af0bff2aeb71e88d7364c1a7ad0fe21..3f0c69d8fa0c6b661c837871d49e7a41e7e52e97 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -946,6 +946,10 @@ void GpuCommandBufferStub::OnRegisterGpuMemoryBuffer(
   if (decoder_) {
     gpu::gles2::ImageManager* image_manager = decoder_->GetImageManager();
     DCHECK(image_manager);
+    if (image_manager->LookupImage(id)) {
+      LOG(ERROR) << "Image already exists with same ID.";
+      return;
+    }
     image_manager->AddImage(image.get(), id);
   }
 }
@@ -956,6 +960,10 @@ void GpuCommandBufferStub::OnDestroyGpuMemoryBuffer(int32 id) {
   if (decoder_) {
     gpu::gles2::ImageManager* image_manager = decoder_->GetImageManager();
     DCHECK(image_manager);
+    if (!image_manager->LookupImage(id)) {
+      LOG(ERROR) << "Image doesnt exist.";

[reveman, 2014/07/27 23:58:32]

nit: "Image with ID doesn't exist."

[sohanjg, 2014/07/28 10:15:58]

Done.

+      return;
+    }
     image_manager->RemoveImage(id);
   }
 }