Fix two build failures - for typeProvider and findElement.

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 7bc59b615db73673e25882fb75f011e85c8be637..5ed44ecda880c34ae8d485c9da20d61327e6940a 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -466,6 +466,11 @@ class AnalysisContextImpl implements InternalAnalysisContext {
 
   @override
   TypeProvider get typeProvider {
+    // The `AnalysisContextTarget.request` results to into the SDK partition,

[Paul Berry, 2016/06/02 12:09:35]

"to" -> "go"

+    // and the TYPE_PROVIDER result is computed and put into the SDK partition
+    // only by the first non-SDK analysis context. So, in order to reuse it
+    // in other analysis context, we need to ask it from the cache.

[Paul Berry, 2016/06/02 12:09:36]

"in other analysis context, we need to ask it" -> "in other analysis contexts,
we need to ask for it"

+    _typeProvider ??= getResult(AnalysisContextTarget.request, TYPE_PROVIDER);
     if (_typeProvider != null) {
       return _typeProvider;
     }