Unbind video texture from mailbox after copying to WebGL.

third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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
@@ skipping 236 matching lines @@
 
     gl->DeleteTextures(1, &sourceTexture);
 
     const GLuint64 contextFenceSync = gl->InsertFenceSyncCHROMIUM();
 
     gl->Flush();
 
     GLbyte syncToken[24];
     gl->GenSyncTokenCHROMIUM(contextFenceSync, syncToken);
     sharedGL->WaitSyncTokenCHROMIUM(syncToken);
+    sharedGL->ProduceTextureDirectCHROMIUM(0, textureInfo->fTarget, mailbox->name);

[Ken Russell (switch to Gerrit), 2016/08/05 00:56:52]

Please add a comment that this disassociates the texture from the mailbox,
preventing memory leaks.

 
     // Undo grContext texture binding changes introduced in this function
     provider->grContext()->resetContext(kTextureBinding_GrGLBackendState);
 
     return true;
 }
 
 bool ImageBuffer::copyRenderingResultsFromDrawingBuffer(DrawingBuffer* drawingBuffer, SourceDrawingBuffer sourceBuffer)
 {
     if (!drawingBuffer || !m_surface->isAccelerated())
@@ skipping 194 matching lines @@
     ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
 
     Vector<unsigned char> result;
     if (!encodeImage(mimeType, quality, &result))
         return "data:,";
 
     return "data:" + mimeType + ";base64," + base64Encode(result);
 }
 
 } // namespace blink