Fix for out-of-bounds intersection (found by fuzzer).

tests/TessellatingPathRendererTests.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #if SK_SUPPORT_GPU
 #include "GrContextFactory.h"
 #include "GrTessellatingPathRenderer.h"
@@ skipping 202 matching lines @@
     path.moveTo(217.326019287109375f, 166.4752960205078125f);
     path.lineTo(226.279266357421875f, 170.929473876953125f);
     path.lineTo(234.3973388671875f,   177.0623626708984375f);
     path.lineTo(262.0921630859375f,   188.746124267578125f);
     path.moveTo(196.23638916015625f,  174.0722198486328125f);
     path.lineTo(416.15277099609375f,  180.138214111328125f);
     path.lineTo(192.651947021484375f, 304.0228271484375f);
     return path;
 }
 
+static SkPath create_path_15() {
+    SkPath path;
+    path.moveTo(    0.0f,   0.0f);
+    path.lineTo(10000.0f,   0.0f);
+    path.lineTo(    0.0f,  -1.0f);
+    path.lineTo(10000.0f,   0.000001f);
+    path.lineTo(    0.0f, -30.0f);
+    return path;
+}
+
 static void test_path(GrDrawTarget* dt, GrRenderTarget* rt, const SkPath& path) {
     GrTessellatingPathRenderer tess;
     GrPipelineBuilder pipelineBuilder;
     pipelineBuilder.setRenderTarget(rt);
     SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
     tess.drawPath(dt, &pipelineBuilder, SK_ColorWHITE, SkMatrix::I(), path, stroke, false);
 }
 
 DEF_GPUTEST(TessellatingPathRendererTests, reporter, factory) {
     GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
@@ skipping 19 matching lines @@
     test_path(dt, rt, create_path_5());
     test_path(dt, rt, create_path_6());
     test_path(dt, rt, create_path_7());
     test_path(dt, rt, create_path_8());
     test_path(dt, rt, create_path_9());
     test_path(dt, rt, create_path_10());
     test_path(dt, rt, create_path_11());
     test_path(dt, rt, create_path_12());
     test_path(dt, rt, create_path_13());
     test_path(dt, rt, create_path_14());
+    test_path(dt, rt, create_path_15());
 }
 #endif