Move prepareForExternalIO implementation from GrContext to GrDrawingManager

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2324473002

Review-Url: https://codereview.chromium.org/2324473002

src/gpu/GrContext.cpp

@@ -518,13 +518,7 @@ void GrContext::prepareSurfaceForExternalIO(GrSurface* surface) {
     RETURN_IF_ABANDONED
     SkASSERT(surface);
     ASSERT_OWNED_RESOURCE(surface);
-    if (surface->surfacePriv().hasPendingIO()) {
-        this->flush();
-    }
-    GrRenderTarget* rt = surface->asRenderTarget();
-    if (fGpu && rt) {
-        fGpu->resolveRenderTarget(rt);
-    }
+    fDrawingManager->prepareSurfaceForExternalIO(surface);
 }
 
 bool GrContext::copySurface(GrSurface* dst, GrSurface* src, const SkIRect& srcRect,

src/gpu/GrDrawContext.cpp

@@ -1115,7 +1115,7 @@ void GrDrawContext::prepareForExternalIO() {
 
     ASSERT_OWNED_RESOURCE(fRenderTarget);
 
-    fDrawingManager->getContext()->prepareSurfaceForExternalIO(fRenderTarget.get());
+    fDrawingManager->prepareSurfaceForExternalIO(fRenderTarget.get());
 }
 
 void GrDrawContext::drawNonAAFilledRect(const GrClip& clip,

src/gpu/GrDrawingManager.cpp

@@ -13,6 +13,7 @@
 #include "GrPathRenderingDrawContext.h"
 #include "GrResourceProvider.h"
 #include "GrSoftwarePathRenderer.h"
+#include "GrSurfacePriv.h"
 #include "SkSurface_Gpu.h"
 #include "SkTTopoSort.h"
 
@@ -135,6 +136,23 @@ void GrDrawingManager::internalFlush(GrResourceCache::FlushType type) {
     fFlushing = false;
 }
 
+void GrDrawingManager::prepareSurfaceForExternalIO(GrSurface* surface) {
+    if (this->wasAbandoned()) {
+        return;
+    }
+    SkASSERT(surface);
+    SkASSERT(surface->getContext() == fContext);
+
+    if (surface->surfacePriv().hasPendingIO()) {
+        this->flush();
+    }
+
+    GrRenderTarget* rt = surface->asRenderTarget();
+    if (fContext->getGpu() && rt) {
+        fContext->getGpu()->resolveRenderTarget(rt);
+    }
+}
+
 GrDrawTarget* GrDrawingManager::newDrawTarget(GrRenderTarget* rt) {
     SkASSERT(fContext);
 

src/gpu/GrDrawingManager.h

@@ -60,6 +60,8 @@ public:
 
     static bool ProgramUnitTest(GrContext* context, int maxStages);
 
+    void prepareSurfaceForExternalIO(GrSurface*);
+
 private:
     GrDrawingManager(GrContext* context, const GrDrawTarget::Options& optionsForDrawTargets,
                      bool isImmediateMode, GrSingleOwner* singleOwner)