This patch is to enable x86 android build.

build/android/envsetup.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.
 
 # Sets up environment for building Chromium on Android. Only Android NDK,
 # Revision 6b on Linux or Mac is offically supported.
 #
 # To run this script, the system environment ANDROID_NDK_ROOT must be set
@@ skipping 27 matching lines @@
     toolchain_dir="linux-x86"
     ;;
   "mac")
     toolchain_dir="darwin-x86"
     ;;
   *)
     echo "Host platform ${host_os} is not supported" >& 2
     return 1
 esac
 
-export ANDROID_TOOLCHAIN="${ANDROID_NDK_ROOT}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/${toolchain_dir}/bin/"
+# The following defines will affect ARM code generation of both C/C++ compiler
+# and V8 mksnapshot.
+case "${TARGET_PRODUCT-full}" in
+  "full")
+    DEFINES=" target_arch=arm"
+    DEFINES+=" arm_neon=0 armv7=1 arm_thumb=1 arm_fpu=vfpv3-d16"
+    toolchain_arch="arm-linux-androideabi-4.4.3"
+    ;;
+  *x86*)
+    DEFINES=" target_arch=ia32 use_libffmpeg=0"
+    toolchain_arch="x86-4.4.3"
+    ;;
+  *)
+    echo "TARGET_PRODUCT: ${TARGET_PRODUCT} is not supported." >& 2
+    return 1
+esac
+
+toolchain_path="${ANDROID_NDK_ROOT}/toolchains/${toolchain_arch}/prebuilt/"
+export ANDROID_TOOLCHAIN="${toolchain_path}/${toolchain_dir}/bin/"
 
 export ANDROID_SDK_VERSION="15"
 
 # Needed by android antfiles when creating apks.
 export ANDROID_SDK_HOME=${ANDROID_SDK_ROOT}
 
 # Add Android SDK/NDK tools to system path.
 export PATH=$PATH:${ANDROID_NDK_ROOT}
 export PATH=$PATH:${ANDROID_SDK_ROOT}/tools
 export PATH=$PATH:${ANDROID_SDK_ROOT}/platform-tools
@@ skipping 31 matching lines @@
   LINK_target=$(basename ${ANDROID_TOOLCHAIN}/*-gcc) \
   AR_target=$(basename ${ANDROID_TOOLCHAIN}/*-ar) \
   "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}"
 }
 
 export OBJCOPY=$(echo ${ANDROID_TOOLCHAIN}/*-objcopy)
 export STRIP=$(echo ${ANDROID_TOOLCHAIN}/*-strip)
 
 # The set of GYP_DEFINES to pass to gyp. Use 'readlink -e' on directories
 # to canonicalize them (remove double '/', remove trailing '/', etc).
-DEFINES="OS=android"
+DEFINES+=" OS=android"
 DEFINES+=" android_build_type=0"  # Currently, Only '0' is supportted.
 DEFINES+=" host_os=${host_os}"
 DEFINES+=" linux_fpic=1"
 DEFINES+=" release_optimize=s"
 DEFINES+=" linux_use_tcmalloc=0"
 DEFINES+=" disable_nacl=1"
 DEFINES+=" remoting=0"
 DEFINES+=" p2p_apis=0"
 DEFINES+=" enable_touch_events=1"
 DEFINES+=" build_ffmpegsumo=0"
 # TODO(bulach): use "shared_libraries" once the transition from executable
 # is over.
 DEFINES+=" gtest_target_type=executable"
 DEFINES+=" branding=Chromium"
 
-# If the TARGET_PRODUCT wasn't set, use 'full' by default.
-if [ -z "${TARGET_PRODUCT}" ]; then
-  TARGET_PRODUCT="full"
-fi
-
-# The following defines will affect ARM code generation of both C/C++ compiler
-# and V8 mksnapshot.
-case "${TARGET_PRODUCT}" in
-  "full")
-    DEFINES+=" target_arch=arm"
-    DEFINES+=" arm_neon=0 armv7=1 arm_thumb=1 arm_fpu=vfpv3-d16"
-    ;;
-  *x86*)
-    DEFINES+=" target_arch=ia32 use_libffmpeg=0"
-    ;;
-  *)
-    echo "TARGET_PRODUCT: ${TARGET_PRODUCT} is not supported." >& 2
-    return 1
-esac
-
 export GYP_DEFINES="${DEFINES}"
 
 # Use the "android" flavor of the Makefile generator for both Linux and OS X.
 export GYP_GENERATORS="make-android"
 
 # Use our All target as the default
 export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"
 
 # We want to use our version of "all" targets.
 export CHROMIUM_GYP_FILE="${CHROME_SRC}/build/all_android.gyp"