Move SkGLContext and some GrGLInterface implementations to skgputest module

src/views/win/SkOSWindow_win.cpp

Index: src/views/win/SkOSWindow_win.cpp
diff --git a/src/views/win/SkOSWindow_win.cpp b/src/views/win/SkOSWindow_win.cpp
index ee851a104f2e43b24d9ac754e692ad91d79f7c2d..e0f0de68dbf987ccecbc8adb2c83c215e6c0cdfa 100644
--- a/src/views/win/SkOSWindow_win.cpp
+++ b/src/views/win/SkOSWindow_win.cpp
@@ -396,6 +396,36 @@ void SkOSWindow::presentGL() {
 
 #if SK_ANGLE
 
+void* get_angle_egl_display(void* nativeDisplay) {
+    PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT;
+    eglGetPlatformDisplayEXT =
+        (PFNEGLGETPLATFORMDISPLAYEXTPROC)eglGetProcAddress("eglGetPlatformDisplayEXT");
+
+    // We expect ANGLE to support this extension
+    if (!eglGetPlatformDisplayEXT) {
+        return EGL_NO_DISPLAY;
+    }
+
+    EGLDisplay display = EGL_NO_DISPLAY;
+    // Try for an ANGLE D3D11 context, fall back to D3D9, and finally GL.
+    EGLint attribs[3][3] = {
+        {
+            EGL_PLATFORM_ANGLE_TYPE_ANGLE,
+            EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
+            EGL_NONE
+        },
+        {
+            EGL_PLATFORM_ANGLE_TYPE_ANGLE,
+            EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE,
+            EGL_NONE
+        },
+    };
+    for (int i = 0; i < 3 && display == EGL_NO_DISPLAY; ++i) {
+        display = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE,nativeDisplay, attribs[i]);
+    }
+    return display;
+}
+
 bool create_ANGLE(EGLNativeWindowType hWnd,
                   int msaaSampleCount,
                   EGLDisplay* eglDisplay,
@@ -419,7 +449,7 @@ bool create_ANGLE(EGLNativeWindowType hWnd,
         EGL_NONE, EGL_NONE
     };
 
-    EGLDisplay display = SkANGLEGLContext::GetD3DEGLDisplay(GetDC(hWnd), false);
+    EGLDisplay display = get_angle_egl_display(GetDC(hWnd), false);
 
     if (EGL_NO_DISPLAY == display) {
         SkDebugf("Could not create ANGLE egl display!\n");