Modify dartanalyzer scripts to look more like dart2js scripts.

sdk/bin/dartanalyzer.bat

Index: sdk/bin/dartanalyzer.bat
diff --git a/sdk/bin/dartanalyzer.bat b/sdk/bin/dartanalyzer.bat
index bca4afbf4474a23a3fbb47a8e58f33533a6911c4..f9b66c2dc3686c70e3caeeaf5f77502984208659 100644
--- a/sdk/bin/dartanalyzer.bat
+++ b/sdk/bin/dartanalyzer.bat
@@ -12,7 +12,6 @@ rem Get rid of surrounding quotes.
 for %%i in ("%RETURNED_BIN_DIR%") do set BIN_DIR=%%~fi
 
 set DART=%BIN_DIR%\dart
-set SNAPSHOT=%BIN_DIR%\snapshots\dartanalyzer.dart.snapshot
 
 rem Get absolute full name for SDK_DIR.
 for %%i in ("%BIN_DIR%\..\") do set SDK_DIR=%%~fi
@@ -22,7 +21,33 @@ if %SDK_DIR:~-1%==\ set SDK_DIR=%SDK_DIR:~0,-1%
 
 set SDK_ARG=--dart-sdk=%SDK_DIR%
 
-"%DART%" "%SNAPSHOT%" "%SDK_ARG%" %*
+set EXTRA_VM_OPTIONS=
+
+if _%DARTANALYZER_DEVELOPER_MODE%_ == _1_ (
+  set EXTRA_VM_OPTIONS=%EXTRA_VM_OPTIONS% --checked
+)
+
+rem We allow extra vm options to be passed in through an environment variable.
+if not "_%DART_VM_OPTIONS%_" == "__" (
+  set EXTRA_VM_OPTIONS=%EXTRA_VM_OPTIONS% %DART_VM_OPTIONS%
+)
+
+rem Get absolute full name for DART_ROOT.
+for %%i in ("%SDK_DIR%\..\") do set DART_ROOT=%%~fi
+
+rem Remove trailing backslash if there is one
+if %DART_ROOT:~-1%==\ set DART_ROOT=%DART_ROOT:~0,-1%
+
+set ANALYZER=%DART_ROOT%\pkg\analyzer\bin\analyzer.dart
+
+rem DART_CONFIGURATION defaults to ReleaseIA32
+if "%DART_CONFIGURATION%"=="" set DART_CONFIGURATION=ReleaseIA32
+
+set BUILD_DIR=%DART_ROOT%\build\%DART_CONFIGURATION%
+
+set PACKAGE_ROOT=%BUILD_DIR%\packages\
+
+"%DART%" %EXTRA_VM_OPTIONS% "--package-root=%PACKAGE_ROOT%" "%ANALYZER%" "%SDK_ARG%" %*
 
 endlocal