[devtools] Round view size when captureScreenshot clip is specified.

Bug: 
Change-Id: Idca8b4471422732fdb854ecc29605d27a09b8c46
Reviewed-on: https://chromium-review.googlesource.com/570422Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486486}

content/browser/devtools/protocol/page_handler.cc

@@ -394,9 +394,10 @@ void PageHandler::CaptureScreenshot(
     emulation_handler_->SetDeviceEmulationParams(modified_params);
 
     if (clip.isJust()) {
-      widget_host->GetView()->SetSize(gfx::ScaleToCeiledSize(
-          gfx::Size(clip.fromJust()->GetWidth(), clip.fromJust()->GetHeight()),
-          dpfactor * clip.fromJust()->GetScale()));
+      double scale = dpfactor * clip.fromJust()->GetScale();
+      widget_host->GetView()->SetSize(
+          gfx::Size(gfx::ToRoundedInt(clip.fromJust()->GetWidth() * scale),
+                    gfx::ToRoundedInt(clip.fromJust()->GetHeight() * scale)));
     } else {
       widget_host->GetView()->SetSize(
           gfx::ScaleToFlooredSize(emulated_view_size, dpfactor));