Add support for defaulting to low quality image interpolation.

third_party/WebKit/Source/config.gni

 # 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("//third_party/WebKit/public/features.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
@@ skipping 10 matching lines @@
   # blink asserts in release build may be controlled by DCHECK_ALWAYS_ON.
   blink_asserts_off_in_release = false
 
   # If true, doesn't compile debug symbols into webcore reducing the
   # size of the binary and increasing the speed of gdb.
   remove_webcore_debug_symbols = false
 
   # If true, enables blink logging macros (WTF_LOG and friends) unconditionally.
   # When false, blink logging macros are enabled only if assertions are enabled.
   blink_logging_always_on = false
+
+  # If true, defaults image interpolation to low quality.
+  use_low_quality_image_interpolation = is_android
 }
 
 # Whether Android build uses OpenMAX DL FFT. Currently supported only on
 # ARMv7+, ARM64, x86 or x64 without webview. Also enables WebAudio support.
 # Whether WebAudio is actually available depends on runtime settings and flags.
 use_openmax_dl_fft =
     is_android && (current_cpu == "x86" || current_cpu == "x64" ||
                    (current_cpu == "arm" && arm_version >= 7) ||
                    current_cpu == "arm64" || current_cpu == "mipsel")
 
@@ skipping 18 matching lines @@
 }
 
 if (use_concatenated_impulse_responses) {
   feature_defines_list += [ "WTF_USE_CONCATENATED_IMPULSE_RESPONSES=1" ]
 }
 
 if (!is_android || use_aura) {
   feature_defines_list += [ "ENABLE_INPUT_MULTIPLE_FIELDS_UI=1" ]
 }
 
-if (is_android) {
+if (use_low_quality_image_interpolation) {
   feature_defines_list += [ "WTF_USE_LOW_QUALITY_IMAGE_INTERPOLATION=1" ]
-} else {
+}
+
+if (!is_android) {
   feature_defines_list += [
     "WTF_USE_ICCJPEG=1",
     "WTF_USE_QCMSLIB=1",
   ]
 }
 
 if (use_webaudio_ffmpeg) {
   feature_defines_list += [ "WTF_USE_WEBAUDIO_FFMPEG=1" ]
 }
 
@@ skipping 12 matching lines @@
 }
 
 # feature_defines_string -------------------------------------------------------
 
 # Convert the list to a space-separated string for passing to scripts.
 # This would be the equivalent of passing '<(feature_defines)' in GYP.
 feature_defines_string =
     exec_script("build/gn_list_to_space_separated_string.py",
                 feature_defines_list,
                 "trim string")