add SK_API to forward declare in canvas.h

include/core/SkCanvas.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCanvas_DEFINED
 #define SkCanvas_DEFINED
 
@@ skipping 22 matching lines @@
 class SkRRect;
 class SkSurface;
 class SkSurface_Base;
 class SkTextBlob;
 class GrContext;
 class GrRenderTarget;
 
 class SkCanvasState;
 
 namespace SkCanvasStateUtils {
-    SkCanvasState* CaptureCanvasState(SkCanvas*);// needs gettotalclip()
+    SK_API SkCanvasState* CaptureCanvasState(SkCanvas*);
 }
 
 /** \class SkCanvas
 
     A Canvas encapsulates all of the state about drawing into a device (bitmap).
     This includes a reference to the device itself, and a stack of matrix/clip
     values. For any given draw call (e.g. drawRect), the geometry of the object
     being drawn is transformed by the concatenation of all the matrices in the
     stack. The transformed geometry is clipped by the intersection of all of
     the clips in the stack.
@@ skipping 1249 matching lines @@
     bool fDeviceCMDirty;            // cleared by updateDeviceCMCache()
     void updateDeviceCMCache();
 
     friend class SkDrawIter;        // needs setupDrawForLayerDevice()
     friend class AutoDrawLooper;
     friend class SkLua;             // needs top layer size and offset
     friend class SkDebugCanvas;     // needs experimental fAllowSimplifyClip
     friend class SkDeferredDevice;  // needs getTopDevice()
     friend class SkSurface_Raster;  // needs getDevice()
     
-    friend SkCanvasState* SkCanvasStateUtils::CaptureCanvasState(SkCanvas*);// needs gettotalclip()
+    // needs gettotalclip()
+    friend SkCanvasState* SkCanvasStateUtils::CaptureCanvasState(SkCanvas*);
     
     SkBaseDevice* createLayerDevice(const SkImageInfo&);
 
     SkBaseDevice* init(SkBaseDevice*);
 
     /**
      *  DEPRECATED
      *
      *  Specify a device for this canvas to draw into. If it is not null, its
      *  reference count is incremented. If the canvas was already holding a
@@ skipping 189 matching lines @@
 
 class SkCanvasClipVisitor {
 public:
     virtual ~SkCanvasClipVisitor();
     virtual void clipRect(const SkRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipRRect(const SkRRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) = 0;
 };
 
 #endif