Add infrastructure for testing the debugger code.

tests/DebugCanvasTest.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Test.h"
+#include "debugger/SkDebugCanvas.h"
+
+static void test_debugRect(skiatest::Reporter* reporter) {
+    SkDebugCanvas canvas(100, 100);
+    canvas.drawRect(SkRect::MakeWH(100, 100), SkPaint());
+
+    const SkTDArray<SkDrawCommand*> cmds = canvas.getDrawCommands();
+    REPORTER_ASSERT(reporter, cmds.count() > 0);
+
+    const SkTDArray<SkString*>* result = cmds[0]->Info();

[mtklein, 2013/09/11 15:15:28]

This is just a suggestion.  We're assuming result != NULL here, which is just
fine by me, but let's write it as

const SkTDArray<SkString*>& result = *cmds[0]->Info();

with whatever parens are needed to make that work.  Then the code later on will
look a little less starry.

[dsinclair, 2013/09/11 15:20:44]

Done.

+    REPORTER_ASSERT(reporter, result->count() > 0);
+
+    SkString expected("SkRect: (0, 0, 100, 100)");
+    REPORTER_ASSERT(reporter, expected == *(*result)[0]);
+}
+
+static void TestDebugCanvas(skiatest::Reporter* reporter) {
+    test_debugRect(reporter);
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("DebugCanvas", TestDebugCanvasClass, TestDebugCanvas)