Move static GL binding initialization to //ui/gl/init.

ui/gl/angle_platform_impl.h

Index: ui/gl/angle_platform_impl.h
diff --git a/ui/gl/angle_platform_impl.h b/ui/gl/angle_platform_impl.h
index 5a0ade6cb4d72967dc2e6a02633cad0bba07af63..99c59a6c0bb2ee6e265767d15e204f5764727748 100644
--- a/ui/gl/angle_platform_impl.h
+++ b/ui/gl/angle_platform_impl.h
@@ -8,13 +8,15 @@
 // Implements the ANGLE platform interface, for functionality like
 // histograms and trace profiling.
 
+#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "third_party/angle/include/platform/Platform.h"
+#include "ui/gl/gl_export.h"
 
 namespace gl {
 
 // Derives the base ANGLE platform and provides implementations
-class ANGLEPlatformImpl : public angle::Platform {
+class GL_EXPORT ANGLEPlatformImpl : NON_EXPORTED_BASE(public angle::Platform) {
  public:
   ANGLEPlatformImpl();
   ~ANGLEPlatformImpl() override;