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

ui/gl/gl_egl_api_implementation.cc

Index: ui/gl/gl_egl_api_implementation.cc
diff --git a/ui/gl/gl_egl_api_implementation.cc b/ui/gl/gl_egl_api_implementation.cc
index 2a81a17493633417182215cab0b034288813769c..22e8f6b722950bdfa4c3ef548fad8500bec4ab05 100644
--- a/ui/gl/gl_egl_api_implementation.cc
+++ b/ui/gl/gl_egl_api_implementation.cc
@@ -12,6 +12,19 @@
 
 namespace gl {
 
+namespace {
+
+void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
+  glClearDepthf(static_cast<GLclampf>(depth));
+}
+
+void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
+                                                    GLclampd z_far) {
+  glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
+}
+
+}  // namespace
+
 RealEGLApi* g_real_egl;
 
 void InitializeStaticGLBindingsEGL() {
@@ -22,6 +35,11 @@ void InitializeStaticGLBindingsEGL() {
   g_real_egl->Initialize(&g_driver_egl);
   g_current_egl_context = g_real_egl;
   g_driver_egl.InitializeExtensionBindings();
+
+  // These two functions take single precision float rather than double
+  // precision float parameters in GLES.
+  ::gl::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
+  ::gl::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
 }
 
 void InitializeDebugGLBindingsEGL() {