enable skia gradients, fix bugs

core/fxge/ge/cfx_renderdevice.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fxge/cfx_renderdevice.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 338 matching lines @@
 CFX_RenderDevice::CFX_RenderDevice()
     : m_pBitmap(nullptr),
       m_Width(0),
       m_Height(0),
       m_bpp(0),
       m_RenderCaps(0),
       m_DeviceClass(0) {}
 
 CFX_RenderDevice::~CFX_RenderDevice() {}
 
-#ifdef _SKIA_SUPPORT_
+#if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
 void CFX_RenderDevice::Flush() {
   m_pDeviceDriver.reset();
 }
 #endif
 
 void CFX_RenderDevice::SetDeviceDriver(
     std::unique_ptr<IFX_RenderDeviceDriver> pDriver) {
   m_pDeviceDriver = std::move(pDriver);
   InitDeviceInfo();
 }
@@ skipping 702 matching lines @@
                              fill_color, stroke_color, fill_mode,
                              FXDIB_BLEND_NORMAL)) {
         return false;
       }
     }
     if (pClippingPath)
       pClippingPath->Append(&TransformedPath, pUser2Device);
   }
   return true;
 }