Move draw on upload decision in GrGpu

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/0341b4427e5f037e3b501ed6e57dfdb7b40f150e

Review URL: https://codereview.chromium.org/1257073003
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 728fb88..c61979b 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -232,6 +232,61 @@
     this->onClearStencilClip(renderTarget, rect, insideClip);
 }
 
+bool GrGpu::getReadPixelsInfo(GrSurface* srcSurface, int width, int height, size_t rowBytes,
+                              GrPixelConfig readConfig, DrawPreference* drawPreference,
+                              ReadPixelTempDrawInfo* tempDrawInfo) {
+    SkASSERT(drawPreference);
+    SkASSERT(tempDrawInfo);
+    SkASSERT(kGpuPrefersDraw_DrawPreference != *drawPreference);
+
+    if (!this->onGetReadPixelsInfo(srcSurface, width, height, rowBytes, readConfig, drawPreference,
+                                   tempDrawInfo)) {
+        return false;
+    }
+
+    // Check to see if we're going to request that the caller draw when drawing is not possible.
+    if (!srcSurface->asTexture() ||
+        !this->caps()->isConfigRenderable(tempDrawInfo->fTempSurfaceDesc.fConfig, false)) {
+        // If we don't have a fallback to a straight read then fail.
+        if (kRequireDraw_DrawPreference == *drawPreference) {
+            return false;
+        }
+        *drawPreference = kNoDraw_DrawPreference;
+    }
+
+    return true;
+}
+bool GrGpu::getWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t rowBytes,
+                               GrPixelConfig srcConfig, DrawPreference* drawPreference,
+                               WritePixelTempDrawInfo* tempDrawInfo) {
+    SkASSERT(drawPreference);
+    SkASSERT(tempDrawInfo);
+    SkASSERT(kGpuPrefersDraw_DrawPreference != *drawPreference);
+
+    if (this->caps()->useDrawInsteadOfPartialRenderTargetWrite() &&
+        SkToBool(dstSurface->asRenderTarget()) &&
+        (width < dstSurface->width() || height < dstSurface->height())) {
+        ElevateDrawPreference(drawPreference, kRequireDraw_DrawPreference);
+    }
+
+    if (!this->onGetWritePixelsInfo(dstSurface, width, height, rowBytes, srcConfig, drawPreference,
+                                    tempDrawInfo)) {
+        return false;
+    }
+
+    // Check to see if we're going to request that the caller draw when drawing is not possible.
+    if (!dstSurface->asRenderTarget() ||
+        !this->caps()->isConfigTexturable(tempDrawInfo->fTempSurfaceDesc.fConfig)) {
+        // If we don't have a fallback to a straight upload then fail.
+        if (kRequireDraw_DrawPreference == *drawPreference ||
+            !this->caps()->isConfigTexturable(srcConfig)) {
+            return false;
+        }
+        *drawPreference = kNoDraw_DrawPreference;
+    }
+    return true;
+}
+
 bool GrGpu::readPixels(GrRenderTarget* target,
                        int left, int top, int width, int height,
                        GrPixelConfig config, void* buffer,