Update repo to use dart2js from pkg/compiler.

sdk/bin/dart2js

Index: sdk/bin/dart2js
diff --git a/sdk/bin/dart2js b/sdk/bin/dart2js
index 79a857be83efe500109c4f7c760fa2a9c008f2f9..57c9d7f157e4a7dca8b018266f7288e2b86fbb91 100755
--- a/sdk/bin/dart2js
+++ b/sdk/bin/dart2js
@@ -20,8 +20,6 @@ BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
 
 SDK_DIR="$(cd "${BIN_DIR}/.." ; pwd -P)"
 
-DART2JS="$SDK_DIR/lib/_internal/compiler/implementation/dart2js.dart"
-
 DART="$BIN_DIR/dart"
 
 SNAPSHOT_DIR="$BIN_DIR/snapshots"
@@ -63,8 +61,25 @@ if [[ $DART_VM_OPTIONS ]]; then
   EXTRA_VM_OPTIONS+=("${OPTIONS[@]}")
 fi
 
+DART_ROOT="$(cd "${SDK_DIR}/.." ; pwd -P)"
+
+DART2JS="$DART_ROOT/pkg/compiler/lib/src/dart2js.dart"
+
+if [ -z "$DART_CONFIGURATION" ];
+then
+  DART_CONFIGURATION="ReleaseIA32"
+fi
+
+if [[ `uname` == 'Darwin' ]]; then
+  BUILD_DIR="$DART_ROOT/xcodebuild/$DART_CONFIGURATION"
+else
+  BUILD_DIR="$DART_ROOT/out/$DART_CONFIGURATION"
+fi
+
+PACKAGE_ROOT="$BUILD_DIR/packages/"
+
 if test -f "$SNAPSHOT"; then

[Paul Berry, 2014/10/29 14:16:52]

Since you've added dart2js_sdk, this script will only ever execute inside
bin/sdk now.  Which means that we will always take the "else" branch.  For
clarity, I'd recommend deleting the "if" test and just exec $DART2JS with the
package root.

(See, for example, sdk/bin/dartanalyzer, which is in the same situation)

[Johnni Winther, 2014/10/30 10:04:31]

Done.

   exec "$DART" "${EXTRA_VM_OPTIONS[@]}" "$SNAPSHOT" "${EXTRA_OPTIONS[@]}" "$@"
 else
-  exec "$DART" "${EXTRA_VM_OPTIONS[@]}" "$DART2JS" "${EXTRA_OPTIONS[@]}" "$@"
+  exec "$DART" "${EXTRA_VM_OPTIONS[@]}" "--package-root=$PACKAGE_ROOT" "$DART2JS" "${EXTRA_OPTIONS[@]}" "$@"
 fi