Mandoline: Add WebGL support

components/html_viewer/BUILD.gn

Index: components/html_viewer/BUILD.gn
diff --git a/components/html_viewer/BUILD.gn b/components/html_viewer/BUILD.gn
index 6ce7625db42591644ccc2ae9c0856618a6a24951..4e710eefdcb5ee3e1aca753d15c64f3b1cbb9852 100644
--- a/components/html_viewer/BUILD.gn
+++ b/components/html_viewer/BUILD.gn
@@ -115,6 +115,8 @@ source_set("lib") {
     "web_clipboard_impl.h",
     "web_cookie_jar_impl.cc",
     "web_cookie_jar_impl.h",
+    "web_graphics_context_3d_command_buffer_impl.cc",
+    "web_graphics_context_3d_command_buffer_impl.h",
     "web_layer_impl.cc",
     "web_layer_impl.h",
     "web_layer_tree_view_impl.cc",
@@ -157,6 +159,7 @@ source_set("lib") {
     "//components/web_view:switches",
     "//components/web_view/public/interfaces",
     "//gin",
+    "//gpu/blink:blink",
     "//media",
     "//media/blink",
     "//media/mojo",
@@ -165,6 +168,7 @@ source_set("lib") {
     "//mojo/cc",
     "//mojo/common",
     "//mojo/converters/surfaces",
+    "//mojo/gles2:headers",
     "//mojo/logging",
     "//mojo/message_pump",
     "//mojo/platform_handle",