Android NDK: r10e -> r11

I have tested that skia_lib builds with {gcc,clang} x {arm_v7_neon,arm64} on my Mac.
Bots seem happy.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1780223002

Review URL: https://codereview.chromium.org/1780223002
diff --git a/platform_tools/android/bin/utils/setup_toolchain.sh b/platform_tools/android/bin/utils/setup_toolchain.sh
index b423446..93322da 100755
--- a/platform_tools/android/bin/utils/setup_toolchain.sh
+++ b/platform_tools/android/bin/utils/setup_toolchain.sh
@@ -35,8 +35,7 @@
   TOOLCHAINS=${SCRIPT_DIR}/../toolchains
 
   ANDROID_ARCH=${ANDROID_ARCH-arm}
-  LLVM=3.6
-  NDK=r10e
+  NDK=r11
 
   if [[ $ANDROID_ARCH == *64* ]]; then
       API=21  # Android 5.0
@@ -52,17 +51,17 @@
   if [ ! -d "$ANDROID_TOOLCHAIN" ]; then
     mkdir -p $TOOLCHAINS
     pushd $TOOLCHAINS
-    curl -o $NDK.bin https://dl.google.com/android/ndk/android-ndk-$NDK-$HOST-x86_64.bin
-    chmod +x $NDK.bin
-    ./$NDK.bin -y
-    ./android-ndk-$NDK/build/tools/make-standalone-toolchain.sh \
+    curl -o $NDK.zip https://dl.google.com/android/repository/android-ndk-$NDK-$HOST-x86_64.zip
+    unzip $NDK.zip
+    UNZIPPED=android-ndk-$NDK-$HOST-x86_64.tar.bz2
+    ./$UNZIPPED/build/tools/make-standalone-toolchain.sh \
+        --use-llvm              \
         --arch=$ANDROID_ARCH    \
-        --llvm-version=$LLVM    \
         --platform=android-$API \
         --install_dir=$TOOLCHAIN
-    cp android-ndk-$NDK/prebuilt/android-$ANDROID_ARCH/gdbserver/gdbserver $TOOLCHAIN
-    rm $NDK.bin
-    rm -rf android-ndk-$NDK
+    cp $UNZIPPED/prebuilt/android-$ANDROID_ARCH/gdbserver/gdbserver $TOOLCHAIN
+    rm $NDK.zip
+    rm -rf $UNZIPPED
     popd
   fi
 
@@ -149,12 +148,4 @@
   ln -sf $ANDROID_TOOLCHAIN_PREFIX-as $ANDROID_TOOLCHAIN/as
 fi
 
-# fix bug in the toolchain in order to enable ccache to work with clang
-if [ $(head -c 2 $ANDROID_TOOLCHAIN_PREFIX-clang) != "#!" ]; then
-   echo -e "#!/bin/bash\n$(cat $ANDROID_TOOLCHAIN_PREFIX-clang)" > $ANDROID_TOOLCHAIN_PREFIX-clang
-fi
-if [ $(head -c 2 $ANDROID_TOOLCHAIN_PREFIX-clang++) != "#!" ]; then
-   echo -e "#!/bin/bash\n$(cat $ANDROID_TOOLCHAIN_PREFIX-clang++)" > $ANDROID_TOOLCHAIN_PREFIX-clang++
-fi
-
 exportVar PATH $ANDROID_TOOLCHAIN:$PATH