gpu: Expose GrContextPriv::abandoned in the public API.

TBR=bsalomon@google.com

Bug: 854416
Change-Id: Iab71ca6e4724a925b0b9791267aac5ddc34f5b15
Reviewed-on: https://skia-review.googlesource.com/137692
Reviewed-by: Khusal Sagar <khushalsagar@chromium.org>
Commit-Queue: Khusal Sagar <khushalsagar@chromium.org>
diff --git a/src/gpu/GrAHardwareBufferImageGenerator.cpp b/src/gpu/GrAHardwareBufferImageGenerator.cpp
index ea1da11..e3ae782 100644
--- a/src/gpu/GrAHardwareBufferImageGenerator.cpp
+++ b/src/gpu/GrAHardwareBufferImageGenerator.cpp
@@ -144,8 +144,7 @@
 }
 
 sk_sp<GrTextureProxy> GrAHardwareBufferImageGenerator::makeProxy(GrContext* context) {
-    if (context->contextPriv().abandoned() ||
-        kOpenGL_GrBackend != context->contextPriv().getBackend()) {
+    if (context->abandoned() || kOpenGL_GrBackend != context->contextPriv().getBackend()) {
         // Check if GrContext is not abandoned and the backend is GL.
         return nullptr;
     }