Make simple paths made of lines work.

Bug #3041098

Change-Id: Ife9c3f01ded10e2bb35b1cdf1a54734d8347fee4
diff --git a/libs/hwui/PathCache.cpp b/libs/hwui/PathCache.cpp
index 70e06a1..377727b 100644
--- a/libs/hwui/PathCache.cpp
+++ b/libs/hwui/PathCache.cpp
@@ -138,8 +138,8 @@
         const SkPath *path, const SkPaint* paint) {
     const SkRect& bounds = path->getBounds();
 
-    const float pathWidth = bounds.width();
-    const float pathHeight = bounds.height();
+    const float pathWidth = fmax(bounds.width(), 1.0f);
+    const float pathHeight = fmax(bounds.height(), 1.0f);
 
     if (pathWidth > mMaxTextureSize || pathHeight > mMaxTextureSize) {
         LOGW("Path too large to be rendered into a texture");