Disable subpixel positioning if DirectWrite isn't initialized

ui/gfx/render_text_unittest.cc

Index: ui/gfx/render_text_unittest.cc
diff --git a/ui/gfx/render_text_unittest.cc b/ui/gfx/render_text_unittest.cc
index 774fd04260f93bb709887cabef20a93e5e7be239..a1f96fd08cfa81bd9eb3edd4b4de7fcd266555cf 100644
--- a/ui/gfx/render_text_unittest.cc
+++ b/ui/gfx/render_text_unittest.cc
@@ -15,6 +15,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/break_list.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/color_utils.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/render_text_harfbuzz.h"
 
@@ -2400,7 +2401,8 @@ TEST_F(RenderTextTest, TextDoesntClip) {
         sk_canvas->peekPixels(NULL, NULL));
     ASSERT_NE(nullptr, buffer);
     for (int y = 0; y < 50; ++y) {
-      EXPECT_EQ(SK_ColorWHITE, buffer[width + y * 300])
+      const SkColor color = buffer[width + y * 300];
+      EXPECT_LT(230U, color_utils::GetLuminanceForColor(color))

[msw, 2014/12/10 23:55:50]

Add a comment explaining the lax condition here.

[msw, 2014/12/11 23:30:12]

Should this perhaps just allow the first column past the expected width to have
anti-aliased content? Optionally: "// Allow [a single column of] anti-aliased
pixels past the expected width."

[ckocagil, 2014/12/12 09:52:11]

Done.

           << "String: " << kTestStrings[i];
     }
   }