add replace_char() method to SkString API (skbug.com/2651)

tests/StringTest.cpp

Index: tests/StringTest.cpp
diff --git a/tests/StringTest.cpp b/tests/StringTest.cpp
index 13ee5ec2153ff6da775bef64887fc16f759da2f4..33eec46eeb618ec13cd60e8dad40df697ad1534c 100644
--- a/tests/StringTest.cpp
+++ b/tests/StringTest.cpp
@@ -148,6 +148,21 @@ DEF_TEST(String, reporter) {
     a.appendU64(0x0000000001000000ULL, 15);
     REPORTER_ASSERT(reporter, a.equals("000000016777216"));
 
+    a.set("hello world");

[tfarina, 2014/06/13 17:02:10]

If Elliot and Mike don't mind, could you set up a separate test for this? e.g.:

DEF_TEST(String_ReplaceChar, r) {
  ...
}

+    a.replaceChar('h', 'h');
+    REPORTER_ASSERT(reporter, a.equals("hello world"));
+    a.replaceChar('x', 'x');
+    REPORTER_ASSERT(reporter, a.equals("hello world"));
+    a.replaceChar('o', 'e');
+    REPORTER_ASSERT(reporter, a.equals("helle werld"));
+    a.replaceChar('x', 'e');
+    REPORTER_ASSERT(reporter, a.equals("helle werld"));
+    a.replaceChar('x', 'z');
+    REPORTER_ASSERT(reporter, a.equals("helle werld"));
+    a.set("");
+    a.replaceChar('a', 'b');
+    REPORTER_ASSERT(reporter, a.equals(""));
+
     static const struct {
         SkScalar    fValue;
         const char* fString;