allow pictures to have a full bounds

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 471a76be8eaa82b22992a6e2de4fd58c538ac2e9..3c26baca5b012da04a84b38b470f926e6bb279dc 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -53,6 +53,12 @@ public:
         bounds->setXYWH(origin.x(), origin.y(), this->width(), this->height());
     }
 
+    SkIRect getGlobalBounds() const {
+        SkIRect bounds;
+        this->getGlobalBounds(&bounds);
+        return bounds;
+    }
+
     int width() const {
         return this->imageInfo().width();
     }
@@ -366,6 +372,7 @@ private:
     friend class SkDeviceFilteredPaint;
     friend class SkDeviceImageFilterProxy;
     friend class SkDeferredDevice;    // for newSurface
+    friend class SkNoPixelsBitmapDevice;
 
     friend class SkSurface_Raster;