Use single InputPackagesResultProvider, without SdkSummaryResultProvider.

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index 52a64b7fc47df3d2b1a8b85632b4658ff2c80400..c5a1525d315b05616b63942d6a56431568a291c5 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -204,6 +204,12 @@ class AnalysisContextImpl implements InternalAnalysisContext {
    */
   List<AnalysisListener> _listeners = new List<AnalysisListener>();
 
+  /**
+   * When we resynthesize SDK element model in the same context, we should
+   * not use a separate SDK cache partition.

[Paul Berry, 2017/01/23 22:36:45]

I'm having trouble understanding which parts of this comment explain what the
bool does and which parts give advice as to how to set it correctly.  Maybe
change it to something like this?

"Determines whether this context should attempt to make use of the global SDK
cache partition.  Note that if this context is responsible for resynthesizing
the SDK element model, this boolean should be set to `false`, so that
resynthesized elements belonging to this context won't leak into the global SDK
cache partition."

[scheglov, 2017/01/23 22:44:49]

Done.

+   */
+  bool useSdkCachePartition = true;
+
   @override
   ResultProvider resultProvider;
 
@@ -739,6 +745,9 @@ class AnalysisContextImpl implements InternalAnalysisContext {
       if (factory == null) {
         return new AnalysisCache(<CachePartition>[_privatePartition]);
       }
+      if (!useSdkCachePartition) {
+        return new AnalysisCache(<CachePartition>[_privatePartition]);
+      }
       DartSdk sdk = factory.dartSdk;
       if (sdk == null) {
         return new AnalysisCache(<CachePartition>[_privatePartition]);