Fix skia build broken by commit c38cd6

Add back one function which is only used by Skia code. And make a couple small
fixes.

Review-Url: https://codereview.chromium.org/2167383002
diff --git a/core/fxge/ge/fx_ge_device.cpp b/core/fxge/ge/fx_ge_device.cpp
index 571f90c..2f4e0a0 100644
--- a/core/fxge/ge/fx_ge_device.cpp
+++ b/core/fxge/ge/fx_ge_device.cpp
@@ -21,6 +21,12 @@
 
 CFX_RenderDevice::~CFX_RenderDevice() {}
 
+#ifdef _SKIA_SUPPORT_
+void CFX_RenderDevice::Flush() {
+  m_pDeviceDriver.reset();
+}
+#endif
+
 void CFX_RenderDevice::SetDeviceDriver(
     std::unique_ptr<IFX_RenderDeviceDriver> pDriver) {
   m_pDeviceDriver = std::move(pDriver);
diff --git a/core/fxge/include/fx_ge.h b/core/fxge/include/fx_ge.h
index aceaa76..ce2f9d3 100644
--- a/core/fxge/include/fx_ge.h
+++ b/core/fxge/include/fx_ge.h
@@ -382,6 +382,7 @@
 
 #ifdef _SKIA_SUPPORT_
   virtual void DebugVerifyBitmapIsPreMultiplied() const;
+  void Flush();
 #endif
 
  private:
diff --git a/core/fxge/skia/fx_skia_device.cpp b/core/fxge/skia/fx_skia_device.cpp
index 5f874e5..3c7ce7e 100644
--- a/core/fxge/skia/fx_skia_device.cpp
+++ b/core/fxge/skia/fx_skia_device.cpp
@@ -1462,7 +1462,8 @@
 }
 
 SkPictureRecorder* CFX_FxgeDevice::CreateRecorder(int size_x, int size_y) {
-  SetDeviceDriver(WrapUnique(new CFX_SkiaDeviceDriver(size_x, size_y)));
+  CFX_SkiaDeviceDriver* skDriver = new CFX_SkiaDeviceDriver(size_x, size_y);
+  SetDeviceDriver(WrapUnique(skDriver));
   return skDriver->GetRecorder();
 }
 
@@ -1481,7 +1482,7 @@
 bool CFX_FxgeDevice::AttachRecorder(SkPictureRecorder* recorder) {
   if (!recorder)
     return false;
-  SetDeviceDriver(new CFX_SkiaDeviceDriver(recorder));
+  SetDeviceDriver(WrapUnique(new CFX_SkiaDeviceDriver(recorder)));
   return true;
 }
 
@@ -1496,9 +1497,8 @@
     return false;
   }
   SetBitmap(pBitmap);
-  CFX_SkiaDeviceDriver* pDriver =
-      new CFX_SkiaDeviceDriver(pBitmap, FALSE, pOriDevice, FALSE);
-  SetDeviceDriver(pDriver);
+  SetDeviceDriver(
+      WrapUnique(new CFX_SkiaDeviceDriver(pBitmap, FALSE, pOriDevice, FALSE)));
   return true;
 }