Flush text contexts before drawing text as path

BUG=416289

Review URL: https://codereview.chromium.org/636233008
diff --git a/src/gpu/GrBitmapTextContext.cpp b/src/gpu/GrBitmapTextContext.cpp
index 8620e97..fa70d32 100755
--- a/src/gpu/GrBitmapTextContext.cpp
+++ b/src/gpu/GrBitmapTextContext.cpp
@@ -407,6 +407,9 @@
             glyph->fPath = path;
         }
 
+        // flush any accumulated draws before drawing this glyph as a path.
+        this->flush();
+
         GrContext::AutoMatrix am;
         SkMatrix translate;
         translate.setTranslate(SkFixedToScalar(vx - SkIntToFixed(glyph->fBounds.fLeft)),