Initial support to test.dart for running precompiler tests on android devices

tools/testing/dart/compiler_configuration.dart

Index: tools/testing/dart/compiler_configuration.dart
diff --git a/tools/testing/dart/compiler_configuration.dart b/tools/testing/dart/compiler_configuration.dart
index 161252a17841a0569f90098f660039ae6d641b04..7fcf990ca5a88e526553618c57990e7bdb3cd5fc 100644
--- a/tools/testing/dart/compiler_configuration.dart
+++ b/tools/testing/dart/compiler_configuration.dart
@@ -374,11 +374,15 @@ class PrecompilerCompilerConfiguration extends CompilerConfiguration {
       cc_flags = "-m64";
     } else if (arch == 'simarm64') {
       cc_flags = "-m64";
+    } else if (arch == 'ia32') {
+      cc_flags = "-m32";
     } else if (arch == 'simarm') {
       cc_flags = "-m32";
     } else if (arch == 'simmips') {
       cc_flags = "-m32";
     } else if (arch == 'arm') {
+      // TODO: If we're not using "--use_blobs" we need to use the arm cross
+      // compiler instead of just 'gcc'.
       cc_flags = "";
     } else if (arch == 'mips') {
       cc_flags = "-EL";
@@ -387,13 +391,13 @@ class PrecompilerCompilerConfiguration extends CompilerConfiguration {
     }
 
     var exec = cc;
-    var args = [
-      shared,
-      cc_flags,
+    var args = [ shared ];
+    if (cc_flags != null && cc_flags.length > 0) args.add(cc_flags);
+    args.addAll([
       '-o',
       '$tempDir/$libname',
       '$tempDir/precompiled.S'
-    ];
+    ]);
 
     return commandBuilder.getCompilationCommand('assemble', tempDir, !useSdk,
         bootstrapDependencies(buildDir), exec, args, environmentOverrides);