Add script segmentation test for Common + Malayalam

BUG=528839
R=behdad,eae

Review URL: https://codereview.chromium.org/1422503010

Cr-Commit-Position: refs/heads/master@{#357174}

third_party/WebKit/Source/platform/fonts/ScriptRunIteratorTest.cpp

@@ -728,7 +728,14 @@ TEST_F(ScriptRunIteratorTest, OddLatinString)
     CHECK_RUNS({ { "ç̈", USCRIPT_LATIN } });
 }
 
+TEST_F(ScriptRunIteratorTest, CommonMalayalam)
+{
+    CHECK_RUNS({ { "100-ാം", USCRIPT_MALAYALAM } });
+}
+
+
 class ScriptRunIteratorICUDataTest : public testing::Test {
+
 public:
     ScriptRunIteratorICUDataTest()
         : m_maxExtensions(0)