Fix ANGLE build

src/gpu/gl/angle/SkANGLEGLContext.cpp

Index: src/gpu/gl/angle/SkANGLEGLContext.cpp
diff --git a/src/gpu/gl/angle/SkANGLEGLContext.cpp b/src/gpu/gl/angle/SkANGLEGLContext.cpp
index 0e37a7e1f6bfe5b42f35a82573dfb0e81cb7d3f2..a6b4e8670cb540da6788eeb45d2e121074fc2444 100644
--- a/src/gpu/gl/angle/SkANGLEGLContext.cpp
+++ b/src/gpu/gl/angle/SkANGLEGLContext.cpp
@@ -156,8 +156,10 @@ GrGLuint SkANGLEGLContext::eglImageToExternalTexture(GrEGLImage image) const {
     if (!this->gl()->hasExtension("GL_OES_EGL_image_external")) {
         return 0;
     }
-    GrGLEGLImageTargetTexture2DProc glEGLImageTargetTexture2D =
-        (GrGLEGLImageTargetTexture2DProc)eglGetProcAddress("glEGLImageTargetTexture2DOES");
+    typedef GrGLvoid (*EGLImageTargetTexture2DProc)(GrGLenum, GrGLeglImage);
+
+    EGLImageTargetTexture2DProc glEGLImageTargetTexture2D =
+        (EGLImageTargetTexture2DProc)eglGetProcAddress("glEGLImageTargetTexture2DOES");
     if (!glEGLImageTargetTexture2D) {
         return 0;
     }