Add GrCaps::isFormatCompressed

This is part of trying to remove uses of GrPixelConfig from the proxy provider

Change-Id: I12d085cfbff86d0e44829ce3ee36744b937b804e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/230576
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/dawn/GrDawnCaps.cpp b/src/gpu/dawn/GrDawnCaps.cpp
index 9e8954b..c9381bc 100644
--- a/src/gpu/dawn/GrDawnCaps.cpp
+++ b/src/gpu/dawn/GrDawnCaps.cpp
@@ -18,6 +18,10 @@
     return false;
 }
 
+bool GrDawnCaps::isFormatCompressed(const GrBackendFormat& format) const {
+    return false;
+}
+
 bool GrDawnCaps::isConfigTexturable(GrPixelConfig config) const {
     switch (config) {
         case kRGBA_8888_GrPixelConfig: