Add glDrawRangeElements to GPU command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 50ae103d860006ede0a77f697f8ff3afcba977a4..d550020efe0c4432724c92493ae63bb192e7f5ed 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -7022,6 +7022,24 @@ error::Error GLES2DecoderImpl::HandleDrawElements(uint32 immediate_data_size,
                         1);
 }
 
+error::Error GLES2DecoderImpl::HandleDrawRangeElements(
+    uint32 immediate_data_size,
+    const void* cmd_data) {
+  if (!unsafe_es3_apis_enabled())
+    return error::kUnknownCommand;
+  const gles2::cmds::DrawRangeElements& c =
+      *static_cast<const gles2::cmds::DrawRangeElements*>(cmd_data);
+  size_t offset = static_cast<size_t>(c.index_offset);
+  const GLvoid* indices = reinterpret_cast<const GLvoid*>(offset);
+  glDrawRangeElements(static_cast<GLenum>(c.mode),

[piman, 2015/02/25 23:28:47]

I'm pretty sure many things won't work right if we don't do some of the logic in
DoDrawElements, at least:
- PrepareTexturesForRender so that WillUseTexImage is called on GLImages bound
to the textures
- ApplyDirtyState so that the lazy frame buffer operation state is committed
(color/depth/stencil masks, depth/stencil test)
- ScopedRenderTo so that WillModifyTexImage/DidModifyTexImage is called on
GLImages bound to the FBO attachments

+                      static_cast<GLuint>(c.start),
+                      static_cast<GLuint>(c.end),
+                      static_cast<GLsizei>(c.count),
+                      static_cast<GLenum>(c.type),
+                      indices);
+  return error::kNoError;
+}
+
 error::Error GLES2DecoderImpl::HandleDrawElementsInstancedANGLE(
     uint32 immediate_data_size,
     const void* cmd_data) {