Use client side arrays for GL_STREAM_DRAW attributes

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 e9ea2f784661e8045f541a695a7cc05a61dbb0f2..6bd554fb03a9358003965fc2843f0446ae4a502e 100644
--- a/gpu/command_buffer/service/buffer_manager.h
+++ b/gpu/command_buffer/service/buffer_manager.h
@@ -19,6 +19,7 @@ namespace gpu {
 namespace gles2 {
 
 class BufferManager;
+class FeatureInfo;
 
 // Info about Buffers currently in the system.
 class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
@@ -60,6 +61,10 @@ class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
     return target() && !IsDeleted();
   }
 
+  bool IsClientSideArray() const {
+    return is_client_side_array_;
+  }
+
  private:
   friend class BufferManager;
   friend class BufferManagerTestBase;
@@ -112,7 +117,11 @@ class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
     deleted_ = true;
   }
 
-  void SetInfo(GLsizeiptr size, GLenum usage, bool shadow);
+  // Sets the size, usage and initial data of a buffer.
+  // If shadow is true then if data is NULL buffer will be initialized to 0.
+  void SetInfo(
+      GLsizeiptr size, GLenum usage, bool shadow, const GLvoid* data,
+      bool is_client_side_array);
 
   // Clears any cache of index ranges.
   void ClearCache();
@@ -143,6 +152,10 @@ class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
   // Whether or not the data is shadowed.
   bool shadowed_;
 
+  // Whether or not this Buffer is not uploaded to the GPU but just
+  // sitting in local memory.
+  bool is_client_side_array_;
+
   // A copy of the data in the buffer. This data is only kept if the target
   // is backed_ = true.
   scoped_array<int8> shadow_;
@@ -159,7 +172,7 @@ class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
 // shared by multiple GLES2Decoders.
 class GPU_EXPORT BufferManager {
  public:
-  BufferManager(MemoryTracker* memory_tracker);
+  BufferManager(MemoryTracker* memory_tracker, FeatureInfo* feature_info);
   ~BufferManager();
 
   // Must call before destruction.
@@ -177,8 +190,9 @@ class GPU_EXPORT BufferManager {
   // Gets a client id for a given service id.
   bool GetClientId(GLuint service_id, GLuint* client_id) const;
 
-  // Sets the size and usage of a buffer.
-  void SetInfo(Buffer* info, GLsizeiptr size, GLenum usage);
+  // Sets the size, usage and initial data of a buffer.
+  // If data is NULL buffer will be initialized to 0 if shadowed.
+  void SetInfo(Buffer* info, GLsizeiptr size, GLenum usage, const GLvoid* data);
 
   // Sets the target of a buffer. Returns false if the target can not be set.
   bool SetTarget(Buffer* info, GLenum target);
@@ -197,6 +211,7 @@ class GPU_EXPORT BufferManager {
   void StopTracking(Buffer* info);
 
   scoped_ptr<MemoryTypeTracker> memory_tracker_;
+  scoped_refptr<FeatureInfo> feature_info_;
 
   // Info for each buffer in the system.
   typedef base::hash_map<GLuint, scoped_refptr<Buffer> > BufferInfoMap;