Expose a lower bound of malloc'd memory via heap statistics

test/unittests/wasm/encoder-unittest.cc

Index: test/unittests/wasm/encoder-unittest.cc
diff --git a/test/unittests/wasm/encoder-unittest.cc b/test/unittests/wasm/encoder-unittest.cc
index f7c54591f9392026c29e059dbb028ed0f63fb0fa..740c0540dc89a2ad65674b774abb91c402e8915d 100644
--- a/test/unittests/wasm/encoder-unittest.cc
+++ b/test/unittests/wasm/encoder-unittest.cc
@@ -52,7 +52,8 @@ class EncoderTest : public TestWithZone {
 
 
 TEST_F(EncoderTest, Function_Builder_Variable_Indexing) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);
@@ -90,7 +91,8 @@ TEST_F(EncoderTest, Function_Builder_Variable_Indexing) {
 
 
 TEST_F(EncoderTest, Function_Builder_Indexing_Variable_Width) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);
@@ -109,7 +111,8 @@ TEST_F(EncoderTest, Function_Builder_Indexing_Variable_Width) {
 }
 
 TEST_F(EncoderTest, Function_Builder_Block_Variable_Width) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);
@@ -123,7 +126,8 @@ TEST_F(EncoderTest, Function_Builder_Block_Variable_Width) {
 }
 
 TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);
@@ -139,7 +143,8 @@ TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate) {
 }
 
 TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate_Locals) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* function = builder->FunctionAt(f_index);