Mark RenderDeviceDriverIface::SetBitsWithMask() as Skia-only.

Change-Id: I6f9b7d69610c16c988c1500762657e617194ae9e
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/73731
Reviewed-by: Hui Yingst <nigi@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

core/fxge/renderdevicedriver_iface.cpp

diff --git a/core/fxge/renderdevicedriver_iface.cpp b/core/fxge/renderdevicedriver_iface.cpp
index 30e6c5d..d6f1cfd 100644
--- a/core/fxge/renderdevicedriver_iface.cpp
+++ b/core/fxge/renderdevicedriver_iface.cpp
@@ -72,6 +72,7 @@
   return false;
 }
 
+#if defined(_SKIA_SUPPORT_)
 bool RenderDeviceDriverIface::SetBitsWithMask(
     const RetainPtr<CFX_DIBBase>& pBitmap,
     const RetainPtr<CFX_DIBBase>& pMask,
@@ -81,6 +82,7 @@
     BlendMode blend_type) {
   return false;
 }
+#endif
 
 #if defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
 void RenderDeviceDriverIface::Flush() {}

core/fxge/renderdevicedriver_iface.h

diff --git a/core/fxge/renderdevicedriver_iface.h b/core/fxge/renderdevicedriver_iface.h
index b99cb3d..5c4a453 100644
--- a/core/fxge/renderdevicedriver_iface.h
+++ b/core/fxge/renderdevicedriver_iface.h
@@ -107,12 +107,14 @@
                            const FX_RECT& clip_rect,
                            int alpha,
                            bool bAlphaMode);
+#if defined(_SKIA_SUPPORT_)
   virtual bool SetBitsWithMask(const RetainPtr<CFX_DIBBase>& pBitmap,
                                const RetainPtr<CFX_DIBBase>& pMask,
                                int left,
                                int top,
                                int bitmap_alpha,
                                BlendMode blend_type);
+#endif
 #if defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
   virtual void Flush();
 #endif