Adding user doc section and core files for new site

site/user/quick/ios.md

+iOS
+===
+
+Prerequisites
+-------------
+
+_These steps should closely follow building on Mac OS X. Those steps seem slightly out of date._
+
+Build and run SampleApp in the XCode IDE
+----------------------------------------
+
+### XCode 4.5
+
+
+To build SampleApp on XCode 4.5 using the IDE these steps should work:
+
+    GYP_DEFINES="skia_os='ios' skia_arch_type='arm' armv7=1 arm_neon=0" ./gyp_skia
+    xed out/gyp/SampleApp.xcodeproj # opens the SampleApp project in the IDE
+
+Note that if you run make at the command line the gyp\_skia script will rerun
+and you'll lose the effect of the GYP\_DEFINES. To avoid this do:
+
+    export GYP_DEFINES="skia_os='ios' skia_arch_type='arm' armv7=1 arm_neon=0"
+
+### XCode 3
+
+Use GYP\_DEFINES to tell gyp\_skia how to build for iOS. Here's a bash shell
+snippet that sets the world up to build SampleApp with XCode 3:
+
+    function buildSampleApp()
+    {
+      sdkVersion="4.3"
+      if [[ "$1" == "sim" ]] ; then
+        export GYP_DEFINES="skia_os='ios' skia_arch_type='x86' \
+          ios_sdk_dir='/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator' \
+          ios_sdk_version='$sdkVersion'"
+      elif [[ "$1" == "iphone" ]] ; then
+        export GYP_DEFINES="skia_os='ios' skia_arch_type='arm' armv7='1' arm_neon='0' \
+          ios_sdk_dir='/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS' \
+          ios_sdk_version='$sdkVersion'"
+      elif [[ "$1" == "mac" ]] ; then
+        export GYP_DEFINES=""
+      else
+        echo "buildSampleApp  expects 'sim', 'iphone', or 'mac'"
+      fi
+      if [[ "$1" == "sim" ]] || [[ "$1" == "iphone" ]] || [[ "$1" == "mac" ]] ; then
+        save=`pwd`
+        cd /chrome/nih/skia/trunk
+        echo "$GYP_DEFINES ./gyp_skia gyp/SampleApp.gyp"
+        ./gyp_skia gyp/SampleApp.gyp
+        cd $save
+      fi
+      if [[ "$1" == "sim" ]] ; then
+        setiossdk iphonesimulator$sdkVersion
+      elif [[ "$1" == "iphone" ]] ; then
+        setiossdk iphoneos$sdkVersion
+      fi
+    }
+
+The script function setiossdk called by buildSampleApp is a
+not-completely-working hackery. When gyp builds an iOS-targeted project, it is
+hard-coded for the iOS simulator. To point the project at either the iOS
+simulator, or an iOS device, the project file must be opened to create a
+custom pbxuser file.
+
+This is accomplished by:
+
+    function setiossdk()
+    {
+      osascript -e 'tell app "Xcode" to quit'
+      osascript -e 'repeat until appIsRunning("Xcode") is false' -e \
+        'do shell script "sleep 1"' -e 'end repeat'
+      save=`pwd`
+      skia
+      cd out/gyp
+      for project in *.xcodeproj; do
+        open $project
+      done
+      osascript -e 'tell app "Xcode" to quit'
+      osascript -e 'repeat until appIsRunning("Xcode") is false' -e \
+        'do shell script "sleep 1"' -e 'end repeat'
+      for project in *.xcodeproj; do
+        lsave=`pwd`
+        cd $project
+        filename=`eval whoami`.pbxuser
+        while [[ ! -s $filename ]] ; do
+          sleep 1
+          echo -n "."
+        done
+        sed -e '/activeSDKPreference/ d' <$filename | sed -e '/activeTarget/ i\
+    \                activeSDKPreference = '$1';' >x$filename
+        if [[ -s x$filename ]] ; then
+          mv x$filename $filename
+        else
+          echo "mv x$filename $project/$filename failed"
+        fi
+        cd $lsave
+      done
+      open SampleApp.xcodeproj
+      cd $save
+    }
+
+In particular, the calls to osascript to wait for Xcode to quit use faulty syntax.
+