Re-enable dynamic NEON support in Skia.

build/android/envsetup_functions.sh

 #!/bin/bash
 
 # Copyright (c) 2012 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.
 
 # Defines functions for envsetup.sh which sets up environment for building
 # Chromium on Android.  The build can be either use the Android NDK/SDK or
 # android source tree.  Each has a unique init function which calls functions
 # prefixed with "common_" that is common for both environment setups.
@@ skipping 93 matching lines @@
   # names and the library is linked with option
   # --section-ordering-file=<orderfile>. The order file is updated by profiling
   # startup after compiling with the order_profiling=1 GYP_DEFINES flag.
   ORDER_DEFINES="order_text_section=${CHROME_SRC}/orderfiles/orderfile.out"
 
   # The following defines will affect ARM code generation of both C/C++ compiler
   # and V8 mksnapshot.
   case "${TARGET_ARCH}" in
     "arm")
       DEFINES+=" arm_neon=0 armv7=1 arm_thumb=1 arm_fpu=vfpv3-d16"
+      DEFINES+=" arm_neon_optional=1"  # Enable dynamic NEON support.
       DEFINES+=" ${ORDER_DEFINES}"
       DEFINES+=" target_arch=arm"
       ;;
     "x86")
     # TODO(tedbo): The ia32 build fails on ffmpeg, so we disable it here.
       DEFINES+=" use_libffmpeg=0"
 
       host_arch=$(uname -m | sed -e \
         's/i.86/ia32/;s/x86_64/x64/;s/amd64/x64/;s/arm.*/arm/;s/i86pc/ia32/')
       DEFINES+=" host_arch=${host_arch}"
@@ skipping 180 matching lines @@
   export GYP_DEFINES="${DEFINES}"
 
   export GYP_GENERATORS="android"
 
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} limit_to_target_all=1"
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} auto_regeneration=0"
 
   export CHROMIUM_GYP_FILE="${CHROME_SRC}/android_webview/all_webview.gyp"
 }