Rename GrDrawingMgr::abandon to wasAbandoned & add a matching entry point to GrDrawingContext

src/gpu/GrDrawingManager.cpp

Index: src/gpu/GrDrawingManager.cpp
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index 4b035bc8638e0e5d7857f905b795bcdbd19b8170..1b01b7afdad950cb574c12e6c212562c776ec25c 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -58,7 +58,7 @@ void GrDrawingManager::reset() {
 }
 
 void GrDrawingManager::flush() {
-    if (fFlushing || this->abandoned()) {
+    if (fFlushing || this->wasAbandoned()) {
         return;
     }
     fFlushing = true;
@@ -161,7 +161,7 @@ GrPathRenderer* GrDrawingManager::getPathRenderer(const GrPathRenderer::CanDrawP
 
 sk_sp<GrDrawContext> GrDrawingManager::drawContext(sk_sp<GrRenderTarget> rt,
                                                    const SkSurfaceProps* surfaceProps) {
-    if (this->abandoned()) {
+    if (this->wasAbandoned()) {
         return nullptr;
     }