Added support for glGetString, glGetShaderSource,...

gpu/command_buffer/client/gles2_implementation.h

Index: gpu/command_buffer/client/gles2_implementation.h
===================================================================
--- gpu/command_buffer/client/gles2_implementation.h	(revision 40176)
+++ gpu/command_buffer/client/gles2_implementation.h	(working copy)
@@ -5,6 +5,7 @@
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 
+#include <map>
 #include <string>
 #include <vector>
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
@@ -62,9 +63,15 @@
   // Gets the value of the result.
   template <typename T>
   T GetResultAs() const {
-    return *static_cast<T*>(result_buffer_);
+    return static_cast<T>(result_buffer_);
   }
 
+  // Gets the GLError through our wrapper.
+  GLenum GetGLError();
+
+  // Sets our wrapper for the GLError.
+  void SetGLError(GLenum error);
+
   // Waits for all commands to execute.
   void WaitForCmd();
 
@@ -78,8 +85,9 @@
   // Sets the contents of a bucket.
   void SetBucketContents(uint32 bucket_id, const void* data, size_t size);
 
-  // Gets the contents of a bucket as a string.
-  std::string GetBucketAsString(uint32 bucket_id);
+  // Gets the contents of a bucket as a string. Returns false if there is no
+  // string available which is a separate case from the empty string.
+  bool GetBucketAsString(uint32 bucket_id, std::string* str);
 
   // Sets the contents of a bucket as a string.
   void SetBucketAsString(uint32 bucket_id, const std::string& str);
@@ -102,10 +110,17 @@
   // unpack alignment as last set by glPixelStorei
   GLint unpack_alignment_;
 
+  // Current GL error bits.
+  uint32 error_bits_;
+
+  // Map of GLenum to Strings for glGetString.  We need to cache these because
+  // the pointer passed back to the client has to remain valid for eternity.
+  typedef std::map<uint32, std::string> GLStringMap;
+  GLStringMap gl_strings_;
+
   DISALLOW_COPY_AND_ASSIGN(GLES2Implementation);
 };
 
-
 }  // namespace gles2
 }  // namespace gpu