Mandoline: WebGL: Pass context creation attributes to GPU.

components/html_viewer/web_graphics_context_3d_command_buffer_impl.cc

Index: components/html_viewer/web_graphics_context_3d_command_buffer_impl.cc
diff --git a/components/html_viewer/web_graphics_context_3d_command_buffer_impl.cc b/components/html_viewer/web_graphics_context_3d_command_buffer_impl.cc
index 70ffcdf0e4762c4792bd80203acbf27ddf27f38c..eeddf3ab04ad3b3cdc9b2a8b915991fca529281c 100644
--- a/components/html_viewer/web_graphics_context_3d_command_buffer_impl.cc
+++ b/components/html_viewer/web_graphics_context_3d_command_buffer_impl.cc
@@ -5,6 +5,7 @@
 #include "components/html_viewer/web_graphics_context_3d_command_buffer_impl.h"
 
 #include "components/mus/public/interfaces/gpu.mojom.h"
+#include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "mojo/application/public/cpp/application_impl.h"
 #include "mojo/cc/context_provider_mojo.h"
 #include "mojo/gles2/gles2_context.h"
@@ -29,9 +30,22 @@ WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
   command_buffer_handle_ = cb.PassInterface().PassHandle();
   CHECK(command_buffer_handle_.is_valid());
   // TODO(penghuang): Support share context.
-  // TODO(penghuang): Fill gl_info and pass attribuites to GPU.
+  // TODO(penghuang): Fill gl_info.
+  gpu::gles2::ContextCreationAttribHelper attrib_helper;
+  attrib_helper.alpha_size = attributes.alpha ? 8 : 0;
+  attrib_helper.depth_size = attributes.depth ? 24 : 0;
+  attrib_helper.stencil_size = attributes.stencil ? 8 : 0;
+  attrib_helper.samples = attributes.antialias ? 4 : 0;
+  attrib_helper.sample_buffers = attributes.antialias ? 1 : 0;
+  attrib_helper.fail_if_major_perf_caveat =
+      attributes.failIfMajorPerformanceCaveat;
+  attrib_helper.bind_generates_resource = false;
+  attrib_helper.webgl_version = attributes.webGLVersion;
+  std::vector<int32_t> attrib_vector;
+  attrib_helper.Serialize(&attrib_vector);
   gles2_context_ = MojoGLES2CreateContext(
       command_buffer_handle_.release().value(),
+      attrib_vector.data(),
       &ContextLostThunk,
       this,
       mojo::Environment::GetDefaultAsyncWaiter());