Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler"

sdk/bin/dart2js

Index: sdk/bin/dart2js
diff --git a/sdk/bin/dart2js b/sdk/bin/dart2js
index 4fe517fbbb65e9193adf205f78cd389d4d5d8255..79a857be83efe500109c4f7c760fa2a9c008f2f9 100755
--- a/sdk/bin/dart2js
+++ b/sdk/bin/dart2js
@@ -20,8 +20,13 @@ 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="$BIN_DIR/snapshots"
+SNAPSHOT="$SNAPSHOT_DIR/dart2js.dart.snapshot"
+
 unset EXTRA_OPTIONS
 declare -a EXTRA_OPTIONS
 
@@ -36,6 +41,10 @@ fi
 unset EXTRA_VM_OPTIONS
 declare -a EXTRA_VM_OPTIONS
 
+if test -f "$SNAPSHOT"; then
+  EXTRA_OPTIONS+=("--library-root=$SDK_DIR")
+fi
+
 # Tell the VM to grow the heap more aggressively. This should only
 # be necessary temporarily until the VM is better at detecting how
 # applications use memory.
@@ -54,21 +63,8 @@ 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"
+if test -f "$SNAPSHOT"; then
+  exec "$DART" "${EXTRA_VM_OPTIONS[@]}" "$SNAPSHOT" "${EXTRA_OPTIONS[@]}" "$@"
 else
-  BUILD_DIR="$DART_ROOT/out/$DART_CONFIGURATION"
+  exec "$DART" "${EXTRA_VM_OPTIONS[@]}" "$DART2JS" "${EXTRA_OPTIONS[@]}" "$@"
 fi
-
-PACKAGE_ROOT="$BUILD_DIR/packages/"
-
-exec "$DART" "${EXTRA_VM_OPTIONS[@]}" "--package-root=$PACKAGE_ROOT" "$DART2JS" "${EXTRA_OPTIONS[@]}" "$@"