Teach GPU command buffer whether a context is webgl.

gpu/command_buffer/common/gles2_cmd_utils.cc

Index: gpu/command_buffer/common/gles2_cmd_utils.cc
diff --git a/gpu/command_buffer/common/gles2_cmd_utils.cc b/gpu/command_buffer/common/gles2_cmd_utils.cc
index be454295585884432fdb9c68cf178b17d0151d96..7a33ab1e48f9364ba885b3bbb595d76609c94c1b 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils.cc
@@ -1082,7 +1082,7 @@ const int32 kBufferDestroyed = 0x3095;  // EGL_BUFFER_DESTROYED
 const int32 kBindGeneratesResource = 0x10000;
 const int32 kFailIfMajorPerfCaveat = 0x10001;
 const int32 kLoseContextWhenOutOfMemory = 0x10002;
-const int32 kES3ContextRequired = 0x10003;
+const int32 kWebGLVersion = 0x10003;
 
 }  // namespace
 
@@ -1099,7 +1099,8 @@ ContextCreationAttribHelper::ContextCreationAttribHelper()
       bind_generates_resource(true),
       fail_if_major_perf_caveat(false),
       lose_context_when_out_of_memory(false),
-      es3_context_required(false) {}
+      webgl_version(0) {
+}
 
 void ContextCreationAttribHelper::Serialize(std::vector<int32>* attribs) const {
   if (alpha_size != -1) {
@@ -1142,8 +1143,8 @@ void ContextCreationAttribHelper::Serialize(std::vector<int32>* attribs) const {
   attribs->push_back(fail_if_major_perf_caveat ? 1 : 0);
   attribs->push_back(kLoseContextWhenOutOfMemory);
   attribs->push_back(lose_context_when_out_of_memory ? 1 : 0);
-  attribs->push_back(kES3ContextRequired);
-  attribs->push_back(es3_context_required ? 1 : 0);
+  attribs->push_back(kWebGLVersion);
+  attribs->push_back(webgl_version);
   attribs->push_back(kNone);
 }
 
@@ -1198,8 +1199,8 @@ bool ContextCreationAttribHelper::Parse(const std::vector<int32>& attribs) {
       case kLoseContextWhenOutOfMemory:
         lose_context_when_out_of_memory = value != 0;
         break;
-      case kES3ContextRequired:
-        es3_context_required = value != 0;
+      case kWebGLVersion:
+        webgl_version = value;
         break;
       case kNone:
         // Terminate list, even if more attributes.