Fixes for re-enabling more MSVC level 4 warnings: gpu/ edition

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index c2b08e722741834f3e8ec84954d9708f6e05b3a3..f120f39bf54a13090479978fb77dc03c940ee54a 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -58,7 +58,6 @@
 #include "gpu/command_buffer/service/vertex_array_manager.h"
 #include "gpu/command_buffer/service/vertex_attrib_manager.h"
 #include "third_party/smhasher/src/City.h"
-#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_fence.h"
 #include "ui/gl/gl_image.h"
 #include "ui/gl/gl_implementation.h"
@@ -556,6 +555,8 @@ class AsyncUploadTokenCompletionObserver
 
 // }  // anonymous namespace.
 
+static const GLuint kDefaultStencilMask = static_cast<GLuint>(-1);
+
 bool GLES2Decoder::GetServiceTextureId(uint32 client_texture_id,
                                        uint32* service_texture_id) {
   return false;
@@ -3107,8 +3108,8 @@ bool GLES2DecoderImpl::CheckFramebufferValid(
           offscreen_target_color_format_) & 0x0008) != 0 ? 0 : 1);
       state_.SetDeviceColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
       glClearStencil(0);
-      state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
-      state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
+      state_.SetDeviceStencilMaskSeparate(GL_FRONT, kDefaultStencilMask);
+      state_.SetDeviceStencilMaskSeparate(GL_BACK, kDefaultStencilMask);
       glClearDepth(1.0f);
       state_.SetDeviceDepthMask(GL_TRUE);
       state_.SetDeviceCapabilityState(GL_SCISSOR_TEST, false);
@@ -3629,8 +3630,8 @@ bool GLES2DecoderImpl::ResizeOffscreenFrameBuffer(const gfx::Size& size) {
         offscreen_target_color_format_) & 0x0008) != 0 ? 0 : 1);
     state_.SetDeviceColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
     glClearStencil(0);
-    state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
-    state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
+    state_.SetDeviceStencilMaskSeparate(GL_FRONT, kDefaultStencilMask);
+    state_.SetDeviceStencilMaskSeparate(GL_BACK, kDefaultStencilMask);
     glClearDepth(0);
     state_.SetDeviceDepthMask(GL_TRUE);
     state_.SetDeviceCapabilityState(GL_SCISSOR_TEST, false);
@@ -5060,8 +5061,8 @@ void GLES2DecoderImpl::ClearUnclearedAttachments(
   if (framebuffer->HasUnclearedAttachment(GL_STENCIL_ATTACHMENT) ||
       framebuffer->HasUnclearedAttachment(GL_DEPTH_STENCIL_ATTACHMENT)) {
     glClearStencil(0);
-    state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
-    state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
+    state_.SetDeviceStencilMaskSeparate(GL_FRONT, kDefaultStencilMask);
+    state_.SetDeviceStencilMaskSeparate(GL_BACK, kDefaultStencilMask);
     clear_bits |= GL_STENCIL_BUFFER_BIT;
   }
 
@@ -7860,8 +7861,8 @@ bool GLES2DecoderImpl::ClearLevel(
       return false;
     }
     glClearStencil(0);
-    state_.SetDeviceStencilMaskSeparate(GL_FRONT, -1);
-    state_.SetDeviceStencilMaskSeparate(GL_BACK, -1);
+    state_.SetDeviceStencilMaskSeparate(GL_FRONT, kDefaultStencilMask);
+    state_.SetDeviceStencilMaskSeparate(GL_BACK, kDefaultStencilMask);
     glClearDepth(1.0f);
     state_.SetDeviceDepthMask(GL_TRUE);
     state_.SetDeviceCapabilityState(GL_SCISSOR_TEST, false);
@@ -10005,8 +10006,8 @@ void GLES2DecoderImpl::DoCopyTextureCHROMIUM(
       return;
   }
 
-  GLenum dest_type_previous;
-  GLenum dest_internal_format;
+  GLenum dest_type_previous = dest_type;
+  GLenum dest_internal_format = internal_format;
   bool dest_level_defined = dest_texture->GetLevelSize(
       GL_TEXTURE_2D, level, &dest_width, &dest_height);