GM: include filename extension (.png) of each output file in JSON summary

gm/gm_expectations.cpp

Index: gm/gm_expectations.cpp
===================================================================
--- gm/gm_expectations.cpp	(revision 9067)
+++ gm/gm_expectations.cpp	(working copy)
@@ -165,7 +165,9 @@
     }
 
     Expectations JsonExpectationsSource::get(const char *testName) {
-        return Expectations(fJsonExpectedResults[testName]);
+        SkString testNameWithExtension(testName);
+        testNameWithExtension.append(".png");

[epoger, 2013/05/08 19:45:08]

Patchset 2 adds ".png" extension to the lines in the JSON file, both when
reading and writing, and updates the self-test results accordingly.

The implementation isn't the cleanest thing in the world... more ".png"
constants floating around... but it gives us the desired output.

+        return Expectations(fJsonExpectedResults[testNameWithExtension.c_str()]);
     }
 
     /*static*/ SkData* JsonExpectationsSource::readIntoSkData(SkStream &stream, size_t maxBytes) {