SurfaceFlinger: Add sourceCrop to screenshot

Adds a sourceCrop Rect parameter to screenshot commands, which allows
clients to capture only a portion of the screen instead of the whole
screen.

Bug: 15137922
Change-Id: I629447573cd34ffb96334cde7ba02490b9ea06d8
diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.h b/services/surfaceflinger/RenderEngine/RenderEngine.h
index 577dc0a..a2d8242 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.h
@@ -89,7 +89,8 @@
 
     // set-up
     virtual void checkErrors() const;
-    virtual void setViewportAndProjection(size_t vpw, size_t vph, size_t w, size_t h, bool yswap) = 0;
+    virtual void setViewportAndProjection(size_t vpw, size_t vph,
+            Rect sourceCrop, size_t hwh, bool yswap) = 0;
     virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha) = 0;
     virtual void setupDimLayerBlending(int alpha) = 0;
     virtual void setupLayerTexturing(const Texture& texture) = 0;