[wasm] Exported memory should set maximum property when maximum is defined.

test/mjsunit/wasm/import-memory.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 (function TestOne() {
@@ skipping 181 matching lines @@
       .exportFunc();
   builder.addImportedMemory("mine");
   let instance = builder.instantiate({mine: memory});
   function grow(pages) { return instance.exports.grow(pages); }
   assertEquals(2, grow(3));
   assertEquals(5*kPageSize, memory.buffer.byteLength);
   assertEquals(5, grow(5));
   assertEquals(10*kPageSize, memory.buffer.byteLength);
   assertThrows(() => memory.grow(1));
 })();
+
+(function TestGrowMemoryExportedMaximum() {
+  print("TestGrowMemoryExportedMaximum");
+  var exp_instance;
+  {
+    let builder = new WasmModuleBuilder();
+    builder.addMemory(1, 10, true);

[ahaas, 2016/11/04 09:12:17]

nit: define constants for these values?

[gdeepti, 2016/11/08 08:01:00]

Not adding constants for these values as these are initial/maximum function
parameters to addMemory and are consistent with the rest of the file. 

+    builder.exportMemoryAs("exported_mem");
+    exp_instance = builder.instantiate();
+  }
+  var instance;
+  {
+    var builder = new WasmModuleBuilder();
+    builder.addImportedMemory("imported_mem");
+    builder.addFunction("mem_size", kSig_i_v)
+      .addBody([kExprMemorySize, kMemoryZero])
+      .exportFunc();
+    builder.addFunction("grow", kSig_i_i)
+      .addBody([kExprGetLocal, 0, kExprGrowMemory, kMemoryZero])
+      .exportFunc();
+    instance = builder.instantiate({
+      imported_mem: exp_instance.exports.exported_mem});
+  }
+  var current_mem_size = 1;

[ahaas, 2016/11/04 09:12:17]

nit: use the constants you defined above here?

[gdeepti, 2016/11/08 08:01:00]

Removed left over constant.

+  for (var i = 1; i < 10; i++) {
+    assertEquals(i, instance.exports.grow(1));
+    assertEquals((i+1), instance.exports.mem_size());
+  }
+  assertEquals(-1, instance.exports.grow(1));
+})();