Add support in smoke for generating static configurations in pieces.

pkg/polymer/test/build/all_phases_test.dart

Index: pkg/polymer/test/build/all_phases_test.dart
diff --git a/pkg/polymer/test/build/all_phases_test.dart b/pkg/polymer/test/build/all_phases_test.dart
index 26a3f42b63f26276bcd9868e2e7c2f31745bcc68..869a98f8cd95304b3c018c27e99a35e25e1c20fb 100644
--- a/pkg/polymer/test/build/all_phases_test.dart
+++ b/pkg/polymer/test/build/all_phases_test.dart
@@ -62,7 +62,7 @@ void main() {
                   smoke_0.XA: smoke_1.PolymerElement,
                 },
                 declarations: {
-                  smoke_0.XA: const {},
+                  smoke_0.XA: {},
                 }));
             configureForDeployment([
                 i0.m_foo,
@@ -102,7 +102,7 @@ void main() {
                   smoke_0.XB: smoke_1.PolymerElement,
                 },
                 declarations: {
-                  smoke_0.XB: const {},
+                  smoke_0.XB: {},
                 }));
             configureForDeployment([
                 i0.m_bar,
@@ -156,9 +156,9 @@ void main() {
                   smoke_3.XC: smoke_1.PolymerElement,
                 },
                 declarations: {
-                  smoke_0.XA: const {},
-                  smoke_2.XB: const {},
-                  smoke_3.XC: const {},
+                  smoke_0.XA: {},
+                  smoke_2.XB: {},
+                  smoke_3.XC: {},
                 }));
             configureForDeployment([
                 i0.m_foo,
@@ -221,8 +221,8 @@ void main() {
                   smoke_0.XA: smoke_1.PolymerElement,
                 },
                 declarations: {
-                  smoke_2.XB: const {},
-                  smoke_0.XA: const {},
+                  smoke_2.XB: {},
+                  smoke_0.XA: {},
                 }));
             configureForDeployment([
                 i0.m_foo,
@@ -280,8 +280,8 @@ void main() {
                   smoke_2.XB: smoke_1.PolymerElement,
                 },
                 declarations: {
-                  smoke_0.XA: const {},
-                  smoke_2.XB: const {},
+                  smoke_0.XA: {},
+                  smoke_2.XB: {},
                 }));
             startPolymer([
                 i0.m_foo,