Add more ES3 commands to GPU command buffer: ClearBuffer*

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 1d31f7040cbb235de74bc0e000b36b58d03e94c2..6a483f6f6afed11e3b477a2288e0e16b3ffcaafa 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils.cc
@@ -822,6 +822,28 @@ bool GLES2Util::ParseUniformName(
   return true;
 }
 
+size_t GLES2Util::CalcClearBufferivDataCount(int buffer) {
+  switch (buffer) {
+    case GL_COLOR:
+      return 4;
+    case GL_STENCIL:
+      return 1;
+    default:
+      return 0;
+  }
+}
+
+size_t GLES2Util::CalcClearBufferfvDataCount(int buffer) {
+  switch (buffer) {
+    case GL_COLOR:
+      return 4;
+    case GL_DEPTH:
+      return 1;
+    default:
+      return 0;
+  }
+}
+
 namespace {
 
 // WebGraphicsContext3DCommandBufferImpl configuration attributes. Those in