Tweak libpng encoding parameters to increase speed on very large images.

ui/gfx/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 671 matching lines @@
     sources -= [
       "test/ui_cocoa_test_helper.h",
       "test/ui_cocoa_test_helper.mm",
     ]
   }
   if (is_linux) {
     deps += [ "//build/linux:fontconfig" ]
   }
 }
 
+test("gfx_perftests") {
+  sources = [
+    "codec/png_codec_perftest.cc",
+  ]
+  data = [
+    "test/data/",
+  ]
+  deps = [
+    ":gfx",
+    "//base",
+    "//cc",

[danakj, 2016/04/22 20:29:45]

Hmmm, I wish that LapTimer was in cc:test_support, but we use it for telemetry
tests which have support built into the binary.

LGTM I suppose for the dep.

+    "//testing/gtest",
+    "//testing/gtest:gtest_main",
+    "//testing/perf",
+  ]
+}
+
 test("gfx_unittests") {
   sources = [
     "font_render_params_linux_unittest.cc",
     "font_unittest.cc",
     "image/image_family_unittest.cc",
     "image/image_ios_unittest.mm",
     "image/image_skia_unittest.cc",
     "image/image_unittest.cc",
     "ios/NSString+CrStringDrawing_unittest.mm",
     "ios/uikit_util_unittest.mm",
@@ skipping 140 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }