Added support for glGetString, glGetShaderSource,...

gpu/command_buffer/service/common_decoder.h

Index: gpu/command_buffer/service/common_decoder.h
===================================================================
--- gpu/command_buffer/service/common_decoder.h	(revision 40176)
+++ gpu/command_buffer/service/common_decoder.h	(working copy)
@@ -57,7 +57,7 @@
 
     // Gets a pointer to a section the bucket. Returns NULL if offset or size is
     // out of range.
-    const void* GetData(size_t offset, size_t size) const;
+    void* GetData(size_t offset, size_t size) const;
 
     template <typename T>
     T GetDataAs(size_t offset, size_t size) const {
@@ -71,7 +71,8 @@
     // Returns false if offset or size is out of range.
     bool SetData(const void* src, size_t offset, size_t size);
 
-    // Sets the bucket data from a string.
+    // Sets the bucket data from a string. Strings are passed NULL terminated to
+    // distinguish between empty string and no string.
     void SetFromString(const std::string& str);
 
    private: