Revert 93066 - Execute all GL commands up to the put offset reported by a each flush.This means g...

gpu/command_buffer/common/constants.h

 // Copyright (c) 2011 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_COMMON_CONSTANTS_H_
 #define GPU_COMMAND_BUFFER_COMMON_CONSTANTS_H_
 
 #include "../common/types.h"
 
 namespace gpu {
 
 typedef int32 CommandBufferOffset;
 const CommandBufferOffset kInvalidCommandBufferOffset = -1;
 
 // This enum must stay in sync with NPDeviceContext3DError.
 namespace error {
   enum Error {
     kNoError,
     kInvalidSize,
     kOutOfBounds,
     kUnknownCommand,
     kInvalidArguments,
     kLostContext,
-    kGenericError
+    kGenericError,
+
+    // This is not an error. It is returned by WaitLatch when it is blocked.
+    // When blocked, the context will not reschedule itself until another
+    // context executes a SetLatch command.
+    kWaiting,
+
+    // This is not an error either. It just hints the scheduler that it can exit
+    // its loop, update state, and schedule other command buffers.
+    kYield
   };
 
   // Return true if the given error code is an actual error.
   inline bool IsError(Error error) {
-    return error != kNoError;
+    switch (error) {
+      case kNoError:
+      case kWaiting:
+      case kYield:
+        return false;
+      default:
+        return true;
+    }
   }
 
   // Provides finer grained information about why the context was lost.
   enum ContextLostReason {
     // This context definitely provoked the loss of context.
     kGuilty,
 
     // This context definitely did not provoke the loss of context.
     kInnocent,
 
@@ skipping 11 matching lines @@
 
 // Common Latch shared memory transfer buffer ID.
 const int32 kLatchSharedMemoryId = 5;
 
 // Invalid latch ID.
 const uint32 kInvalidLatchId = 0xffffffffu;
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_CONSTANTS_H_