remove view matrix from context

BUG=skia:

Review URL: https://codereview.chromium.org/808703006
diff --git a/src/gpu/GrBitmapTextContext.h b/src/gpu/GrBitmapTextContext.h
index 9aa5dbd..ad21a2f 100644
--- a/src/gpu/GrBitmapTextContext.h
+++ b/src/gpu/GrBitmapTextContext.h
@@ -38,11 +38,12 @@
 
     GrBitmapTextContext(GrContext*, const SkDeviceProperties&);
 
-    virtual bool canDraw(const SkPaint& paint) SK_OVERRIDE;
+    virtual bool canDraw(const SkPaint& paint, const SkMatrix& viewMatrix) SK_OVERRIDE;
 
-    virtual void onDrawText(const GrPaint&, const SkPaint&, const char text[], size_t byteLength,
+    virtual void onDrawText(const GrPaint&, const SkPaint&, const SkMatrix& viewMatrix,
+                            const char text[], size_t byteLength,
                             SkScalar x, SkScalar y) SK_OVERRIDE;
-    virtual void onDrawPosText(const GrPaint&, const SkPaint&,
+    virtual void onDrawPosText(const GrPaint&, const SkPaint&, const SkMatrix& viewMatrix,
                                const char text[], size_t byteLength,
                                const SkScalar pos[], int scalarsPerPosition,
                                const SkPoint& offset) SK_OVERRIDE;