Initialize variable in QueryTimestampBits

ui/gl/gpu_timing.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gpu_timing.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/time/time.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_version_info.h"
 
 namespace gl {
 
 class TimeElapsedTimerQuery;
 class TimerQuery;
 
 int64_t NanoToMicro(uint64_t nano_seconds) {
   const uint64_t up = nano_seconds + base::Time::kNanosecondsPerMicrosecond / 2;
   return static_cast<int64_t>(up / base::Time::kNanosecondsPerMicrosecond);
 }
 
 int32_t QueryTimestampBits() {
-  GLint timestamp_bits;
+  GLint timestamp_bits = 0;
   glGetQueryiv(GL_TIMESTAMP, GL_QUERY_COUNTER_BITS, &timestamp_bits);
   return static_cast<int32_t>(timestamp_bits);
 }
 
 class GPUTimingImpl : public GPUTiming {
  public:
    GPUTimingImpl(GLContextReal* context);
   ~GPUTimingImpl() override;
 
   void ForceTimeElapsedQuery() { force_time_elapsed_query_ = true; }
@@ skipping 624 matching lines @@
 
 void GPUTimingClient::ForceTimeElapsedQuery() {
   DCHECK(gpu_timing_);
   gpu_timing_->ForceTimeElapsedQuery();
 }
 
 GPUTimingClient::~GPUTimingClient() {
 }
 
 }  // namespace gl