Fix query for GR_GL_IMPLEMENTATION_COLOR_READ_FORMAT for GrPixelConfigs that aren't renderable

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 1aed2f61cec9c4f69b419bac391b1248f4e0f197..c2773231df902df81c2b5d10779708ba6c83daa2 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -320,7 +320,8 @@ public:
     bool readPixelsSupported(GrPixelConfig surfaceConfig,
                              GrPixelConfig readConfig,
                              std::function<void (GrGLenum, GrGLint*)> getIntegerv,
-                             std::function<bool ()> bindRenderTarget) const;
+                             std::function<bool ()> bindRenderTarget,
+                             std::function<void ()> unbindRenderTarget) const;
 
     bool isCoreProfile() const { return fIsCoreProfile; }