Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

gpu/command_buffer/service/buffer_manager.h

Index: gpu/command_buffer/service/buffer_manager.h
diff --git a/gpu/command_buffer/service/buffer_manager.h b/gpu/command_buffer/service/buffer_manager.h
index b3b4ede36b898e706cd8bf946b01dc801e567628..8cea9423234ed810889c762e65b8c7255efbde8f 100644
--- a/gpu/command_buffer/service/buffer_manager.h
+++ b/gpu/command_buffer/service/buffer_manager.h
@@ -11,10 +11,14 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
+
+class CommonDecoder;
+
 namespace gles2 {
 
 // This class keeps track of the buffers and their sizes so we can do
@@ -119,6 +123,8 @@ class GPU_EXPORT BufferManager {
     }
 
     void SetInfo(GLsizeiptr size, GLenum usage, bool shadow);
+    void SetInfo(GLsizeiptr size, GLenum usage, CommonDecoder* decoder,
+                 int32 shm_id, uint32 shm_offset);
 
     // Clears any cache of index ranges.
     void ClearCache();
@@ -153,6 +159,13 @@ class GPU_EXPORT BufferManager {
     // A map of ranges to the highest value in that range of a certain type.
     typedef std::map<Range, GLuint, Range::Less> RangeToMaxValueMap;
     RangeToMaxValueMap range_set_;
+
+    // The decoder pointer is reset if the decoder is destroyed.
+    base::WeakPtr<CommonDecoder> decoder_;

[greggman, 2012/05/24 20:56:00]

I'm a little leary of tracking decoders per buffer though I don't see another
way a the moment.

But, since shared contexts now have to be in the same process maybe the shared
memory management should move from CommonDecoder to some object hanging off of
ContextGroup

+
+    // The shared memory used with this Buffer.
+    int32 shm_id_;
+    uint32 shm_offset_;
   };
 
   BufferManager();
@@ -176,6 +189,10 @@ class GPU_EXPORT BufferManager {
   // Sets the size and usage of a buffer.
   void SetInfo(BufferInfo* info, GLsizeiptr size, GLenum usage);
 
+  // Sets the size, usage and shared memory of a buffer.
+  void SetInfo(BufferInfo* info, GLsizeiptr size, GLenum usage,
+               CommonDecoder* decoder, int32 shm_id, uint32 shm_offset);
+
   // Sets the target of a buffer. Returns false if the target can not be set.
   bool SetTarget(BufferInfo* info, GLenum target);