Revert of Change clear() to respect the clip

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index c7a43fe2a6ebd112867858a4cb2b5446ca23cb09..bb6cb487b0b296a2c9592f7382d0f7eb5153cfb6 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -65,15 +65,13 @@
 
     GrContext* context() const { return fContext; }
 
-    // set all pixels to 0
-    void clearAll();
-
     virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE;
 
     virtual SkImageInfo imageInfo() const SK_OVERRIDE {
         return fRenderTarget ? fRenderTarget->surfacePriv().info() : SkImageInfo::MakeUnknown();
     }
 
+    virtual void clear(SkColor color) SK_OVERRIDE;
     virtual void drawPaint(const SkDraw&, const SkPaint& paint) SK_OVERRIDE;
     virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
                             const SkPoint[], const SkPaint& paint) SK_OVERRIDE;