Move read pixels format info into ConifgInfo in GrGLCaps

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index f5c646c86fb636161350ae4d28c98096bf7778e7..cbb4360f5d4b9d391b1363eee7a2143ca331217f 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -1925,8 +1925,7 @@ bool GrGLGpu::onGetReadPixelsInfo(GrSurface* srcSurface, int width, int height,
         tempDrawInfo->fSwapRAndB = true;
         ElevateDrawPreference(drawPreference, kGpuPrefersDraw_DrawPreference);
     } else if (readConfig == kBGRA_8888_GrPixelConfig &&
-               !this->glCaps().readPixelsSupported(this->glInterface(), GR_GL_BGRA,
-                                                   GR_GL_UNSIGNED_BYTE, srcConfig)) {
+               !this->glCaps().readPixelsSupported(this->glInterface(), readConfig, srcConfig)) {
         tempDrawInfo->fTempSurfaceDesc.fConfig = kRGBA_8888_GrPixelConfig;
         tempDrawInfo->fSwapRAndB = true;
         ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);