Let canvas decide how to handle the lost resource: WebGL part

Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 259 matching lines @@
     // set m_parentDrawingBuffer to make sure 'this' stays alive as long as it has live mailboxes
     ASSERT(!frontColorBufferMailbox->m_parentDrawingBuffer);
     frontColorBufferMailbox->m_parentDrawingBuffer = this;
     *outMailbox = frontColorBufferMailbox->mailbox;
     m_frontColorBuffer = frontColorBufferMailbox->textureInfo;
     return true;
 }
 
 void DrawingBuffer::mailboxReleased(const blink::WebExternalTextureMailbox& mailbox, bool lostResource)
 {
-    if (lostResource) {
-        // TODO(hmin): handle the case if the resource is lost.
-        return;
-    }
-
-    if (m_destructionInProgress) {
+    if (m_destructionInProgress || m_context->isContextLost() || lostResource) {
         mailboxReleasedWhileDestructionInProgress(mailbox);
         return;
     }
 
     for (size_t i = 0; i < m_textureMailboxes.size(); i++) {
         RefPtr<MailboxInfo> mailboxInfo = m_textureMailboxes[i];
         if (nameEquals(mailboxInfo->mailbox, mailbox)) {
             mailboxInfo->mailbox.syncPoint = mailbox.syncPoint;
             ASSERT(mailboxInfo->m_parentDrawingBuffer.get() == this);
             mailboxInfo->m_parentDrawingBuffer.clear();
@@ skipping 758 matching lines @@
 void DrawingBuffer::deleteChromiumImageForTexture(TextureInfo* info)
 {
     if (info->imageId) {
         m_context->releaseTexImage2DCHROMIUM(GL_TEXTURE_2D, info->imageId);
         m_context->destroyImageCHROMIUM(info->imageId);
         info->imageId = 0;
     }
 }
 
 } // namespace blink