Add onImageInfo call to SkImage_Base.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1903483003

Review URL: https://codereview.chromium.org/1903483003
diff --git a/src/image/SkImage_Gpu.h b/src/image/SkImage_Gpu.h
index 333a963..612741e 100644
--- a/src/image/SkImage_Gpu.h
+++ b/src/image/SkImage_Gpu.h
@@ -12,6 +12,7 @@
 #include "GrTexture.h"
 #include "GrGpuResourcePriv.h"
 #include "SkBitmap.h"
+#include "SkGr.h"
 #include "SkImage_Base.h"
 #include "SkImagePriv.h"
 #include "SkSurface.h"
@@ -25,6 +26,10 @@
     SkImage_Gpu(int w, int h, uint32_t uniqueID, SkAlphaType, GrTexture*, SkBudgeted);
     ~SkImage_Gpu() override;
 
+    SkImageInfo onImageInfo() const override {
+        return GrMakeInfoFromTexture(fTexture, fTexture->width(), fTexture->height(), isOpaque());
+    }
+
     void applyBudgetDecision() const {
         if (SkBudgeted::kYes == fBudgeted) {
             fTexture->resourcePriv().makeBudgeted();