exo: Recreate Surface resources on context lost.

components/exo/buffer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/exo/buffer.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>
@@ skipping 353 matching lines @@
       query_type_(query_type),
       use_zero_copy_(use_zero_copy),
       is_overlay_candidate_(is_overlay_candidate),
       use_count_(0) {}
 
 Buffer::~Buffer() {}
 
 std::unique_ptr<cc::SingleReleaseCallback> Buffer::ProduceTextureMailbox(
     cc::TextureMailbox* texture_mailbox,
     bool secure_output_only,
-    bool client_usage) {
+    bool client_usage,
+    base::Closure* detach_callback) {
+  DCHECK(detach_callback->is_null());
   // Non-client usage can only be allowed when the client is not allowed to
   // use the buffer. If the buffer has been released to the client then it
   // can no longer be used as the client might be writing to it.
   if (!client_usage && !use_count_)
     return nullptr;
 
   DLOG_IF(WARNING, use_count_ && client_usage)
       << "Producing a texture mailbox for a buffer that has not been released";
 
   // Some clients think that they can reuse a buffer before it's released by
@@ skipping 19 matching lines @@
   scoped_refptr<cc::ContextProvider> context_provider =
       aura::Env::GetInstance()
           ->context_factory()
           ->SharedMainThreadContextProvider();
   if (!context_provider) {
     DLOG(WARNING) << "Failed to acquire a context provider";
     Release();  // Decrements the use count
     return nullptr;
   }
 
+  // Add a callback to ensure this buffer isn't released while it's attached
+  // to a surface.
+  use_count_++;
+  *detach_callback = base::Bind(&Buffer::Release, AsWeakPtr());
+
   // Create a new image texture for |gpu_memory_buffer_| with |texture_target_|
   // if one doesn't already exist. The contents of this buffer are copied to
   // |texture| using a call to CopyTexImage.
   if (!contents_texture_) {
     contents_texture_ = base::WrapUnique(
         new Texture(context_provider.get(), gpu_memory_buffer_.get(),
                     texture_target_, query_type_));
   }
 
   if (use_zero_copy_) {
@@ skipping 73 matching lines @@
 }
 
 void Buffer::ReleaseContentsTexture(std::unique_ptr<Texture> texture) {
   TRACE_EVENT0("exo", "Buffer::ReleaseContentsTexture");
 
   contents_texture_ = std::move(texture);
   Release();
 }
 
 }  // namespace exo