Use BufferContext + offset instead of BufferPointer.

pkg/analyzer/tool/summary/generate.dart

Index: pkg/analyzer/tool/summary/generate.dart
diff --git a/pkg/analyzer/tool/summary/generate.dart b/pkg/analyzer/tool/summary/generate.dart
index 51dad39cfa4c33cff46d39245972d273c1a9d710..4f9018e545f7fbd49f26b473bcdec22f742f02c9 100644
--- a/pkg/analyzer/tool/summary/generate.dart
+++ b/pkg/analyzer/tool/summary/generate.dart
@@ -749,9 +749,9 @@ class _CodeGenerator {
       out('int get size => 1;');
       out();
       out('@override');
-      out('${idlPrefix(name)} read(fb.BufferPointer bp) {');
+      out('${idlPrefix(name)} read(fb.BufferContext bc, int offset) {');
       indent(() {
-        out('int index = const fb.Uint8Reader().read(bp);');
+        out('int index = const fb.Uint8Reader().read(bc, offset);');
         out('return index < $count ? ${idlPrefix(name)}.values[index] : $def;');
       });
       out('}');
@@ -766,9 +766,10 @@ class _CodeGenerator {
     out('class $implName extends Object with $mixinName'
         ' implements ${idlPrefix(name)} {');
     indent(() {
-      out('final fb.BufferPointer _bp;');
+      out('final fb.BufferContext _bc;');
+      out('final int _bcOffset;');
       out();
-      out('$implName(this._bp);');
+      out('$implName(this._bc, this._bcOffset);');
       out();
       // Write cache fields.
       for (idlModel.FieldDeclaration field in cls.fields) {
@@ -824,7 +825,7 @@ class _CodeGenerator {
         } else {
           out('$returnType get $fieldName {');
           indent(() {
-            String readExpr = '$readCode.vTableGet(_bp, $index, $def)';
+            String readExpr = '$readCode.vTableGet(_bc, _bcOffset, $index, $def)';
             out('_$fieldName ??= $readExpr;');
             out('return _$fieldName;');
           });
@@ -906,7 +907,7 @@ class _CodeGenerator {
       out('const $readerName();');
       out();
       out('@override');
-      out('$implName createObject(fb.BufferPointer bp) => new $implName(bp);');
+      out('$implName createObject(fb.BufferContext bc, int offset) => new $implName(bc, offset);');
     });
     out('}');
   }
@@ -915,8 +916,8 @@ class _CodeGenerator {
     String name = cls.name;
     out('${idlPrefix(name)} read$name(List<int> buffer) {');
     indent(() {
-      out('fb.BufferPointer rootRef = new fb.BufferPointer.fromBytes(buffer);');
-      out('return const _${name}Reader().read(rootRef);');
+      out('fb.BufferContext rootRef = new fb.BufferContext.fromBytes(buffer);');
+      out('return const _${name}Reader().read(rootRef, 0);');
     });
     out('}');
   }