Remove overly agressive ASSERTs on output GL parameters.

gpu/command_buffer/client/gles2_implementation.h

 // Copyright (c) 2012 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.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 
 #include <GLES2/gl2.h>
 
 #include <map>
@@ skipping 58 matching lines @@
   #define GPU_CLIENT_DCHECK(v) DCHECK(v)
 #else
   #define GPU_CLIENT_VALIDATE_DESTINATION_INITALIZATION_ASSERT(v) ASSERT(v)
   #define GPU_CLIENT_DCHECK(v) ASSERT(v)
 #endif
 
 #define GPU_CLIENT_VALIDATE_DESTINATION_INITALIZATION(type, ptr) \
     GPU_CLIENT_VALIDATE_DESTINATION_INITALIZATION_ASSERT(ptr && \
         (ptr[0] == static_cast<type>(0) || ptr[0] == static_cast<type>(-1)));
 
+#define GPU_CLIENT_VALIDATE_DESTINATION_OPTIONAL_INITALIZATION(type, ptr) \
+    GPU_CLIENT_VALIDATE_DESTINATION_INITALIZATION_ASSERT(!ptr || \
+        (ptr[0] == static_cast<type>(0) || ptr[0] == static_cast<type>(-1)));
+
 struct GLUniformDefinitionCHROMIUM;
 
 namespace gpu {
 
 class MappedMemoryManager;
 class ScopedTransferBufferPtr;
 class TransferBufferInterface;
 
 namespace gles2 {
 
@@ skipping 509 matching lines @@
 
 inline bool GLES2Implementation::GetTexParameterivHelper(
     GLenum /* target */, GLenum /* pname */, GLint* /* params */) {
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_