Add dirty_after_edit to SkPath::moveTo. Add commented out test case that triggers assert.

tests/PathTest.cpp

Index: tests/PathTest.cpp
diff --git a/tests/PathTest.cpp b/tests/PathTest.cpp
index 0de64b06febf5a145245bfa0a9f64eec0229a00e..57587c4a35f9258a74abbb67e24794667c3539cd 100644
--- a/tests/PathTest.cpp
+++ b/tests/PathTest.cpp
@@ -1504,7 +1504,19 @@ static void test_conservativelyContains(skiatest::Reporter* reporter) {
                                                                                 SkIntToScalar(20),
                                                                                 SkIntToScalar(5))));
 
-    // same as above path and first test but with an extra moveTo.
+
+    // Test that multiple move commands do not cause asserts.
+
+    // At the time of writing, this would not modify cached convexity. This caused an assert while
+    // checking conservative containment again. http://skbug.com/1460
+    path.moveTo(SkIntToScalar(100), SkIntToScalar(100));
+#if 0
+    REPORTER_ASSERT(reporter, path.conservativelyContainsRect(SkRect::MakeXYWH(SkIntToScalar(50), 0,
+                                                                               SkIntToScalar(10),
+                                                                               SkIntToScalar(10))));
+#endif
+
+    // Same as above path and first test but with an extra moveTo.
     path.reset();
     path.moveTo(100, 100);
     path.moveTo(0, 0);
@@ -1515,6 +1527,21 @@ static void test_conservativelyContains(skiatest::Reporter* reporter) {
                                                                                SkIntToScalar(10),
                                                                                SkIntToScalar(10))));
 
+    // Test that multiple move commands do not cause asserts and that the function
+    // is not confused by the multiple moves.
+    path.reset();
+    path.moveTo(0, 0);
+    path.lineTo(SkIntToScalar(100), 0);
+    path.lineTo(0, SkIntToScalar(100));
+    path.moveTo(0, SkIntToScalar(200));
+    path.lineTo(SkIntToScalar(100), SkIntToScalar(200));
+    path.lineTo(0, SkIntToScalar(300));
+
+    REPORTER_ASSERT(reporter, !path.conservativelyContainsRect(
+                                                            SkRect::MakeXYWH(SkIntToScalar(50), 0,
+                                                                             SkIntToScalar(10),
+                                                                             SkIntToScalar(10))));
+
     path.reset();
     path.lineTo(100, 100);
     REPORTER_ASSERT(reporter, !path.conservativelyContainsRect(SkRect::MakeXYWH(0, 0, 1, 1)));