harden and speed up path op unit tests

PathOps tests internal routines direcctly. Check to make sure that
test points, lines, quads, curves, triangles, and bounds read from
arrays are valid (i.e., don't contain NaN) before calling the
test function.

Repurpose the test flags.
- make 'v' verbose test region output against path output
- make 'z' single threaded (before it made it multithreaded)

The latter change speeds up tests run by the buildbot by 2x to 3x.

BUG=

Review URL: https://codereview.chromium.org/19374003

git-svn-id: http://skia.googlecode.com/svn/trunk@10107 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/PathOpsQuadLineIntersectionTest.cpp b/tests/PathOpsQuadLineIntersectionTest.cpp
index 4227ee5..02c925c 100644
--- a/tests/PathOpsQuadLineIntersectionTest.cpp
+++ b/tests/PathOpsQuadLineIntersectionTest.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 #include "PathOpsExtendedTest.h"
+#include "PathOpsTestCommon.h"
 #include "SkIntersections.h"
 #include "SkPathOpsLine.h"
 #include "SkPathOpsQuad.h"
@@ -72,7 +73,9 @@
     bool flipped = false;
     for (size_t index = 0; index < oneOffs_count; ++index) {
         const SkDQuad& quad = oneOffs[index].quad;
+        SkASSERT(ValidQuad(quad));
         const SkDLine& line = oneOffs[index].line;
+        SkASSERT(ValidLine(line));
         SkIntersections intersections;
         int result = doIntersect(intersections, quad, line, flipped);
         for (int inner = 0; inner < result; ++inner) {
@@ -93,7 +96,9 @@
     for (size_t index = 0; index < lineQuadTests_count; ++index) {
         int iIndex = static_cast<int>(index);
         const SkDQuad& quad = lineQuadTests[index].quad;
+        SkASSERT(ValidQuad(quad));
         const SkDLine& line = lineQuadTests[index].line;
+        SkASSERT(ValidLine(line));
         SkReduceOrder reducer1, reducer2;
         int order1 = reducer1.reduce(quad, SkReduceOrder::kFill_Style);
         int order2 = reducer2.reduce(line);