gpu: Pull some variables onto the stack in the decoder

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 7ecd8d5f47bf07b2f1410eb945e5d1295423c7b6..05ba2c9c1efe3d707969c25500436b32f42a415f 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -8958,6 +8958,7 @@ error::Error GLES2DecoderImpl::HandleVertexAttribIPointer(
   const gles2::cmds::VertexAttribIPointer& c =
       *static_cast<const gles2::cmds::VertexAttribIPointer*>(cmd_data);
 
+  GLsizei offset = c.offset;
   if (!state_.bound_array_buffer.get() ||
       state_.bound_array_buffer->IsDeleted()) {
     if (state_.vertex_attrib_manager.get() ==
@@ -8966,7 +8967,7 @@ error::Error GLES2DecoderImpl::HandleVertexAttribIPointer(
           GL_INVALID_OPERATION,
           "glVertexAttribIPointer", "no array buffer bound");
       return error::kNoError;
-    } else if (c.offset != 0) {
+    } else if (offset != 0) {
       LOCAL_SET_GL_ERROR(
           GL_INVALID_OPERATION,
           "glVertexAttribIPointer", "client side arrays are not allowed");
@@ -8978,7 +8979,6 @@ error::Error GLES2DecoderImpl::HandleVertexAttribIPointer(
   GLint size = c.size;
   GLenum type = c.type;
   GLsizei stride = c.stride;
-  GLsizei offset = c.offset;
   const void* ptr = reinterpret_cast<const void*>(offset);
   if (!validators_->vertex_attrib_i_type.IsValid(type)) {
     LOCAL_SET_GL_ERROR_INVALID_ENUM("glVertexAttribIPointer", type, "type");
@@ -13149,11 +13149,12 @@ error::Error GLES2DecoderImpl::HandleWaitSyncTokenCHROMIUM(
   const gpu::CommandBufferNamespace kMaxNamespaceId =
       gpu::CommandBufferNamespace::NUM_COMMAND_BUFFER_NAMESPACES;
 
-  const gpu::CommandBufferNamespace namespace_id =
-      ((c.namespace_id >= static_cast<int32_t>(kMinNamespaceId)) &&
-       (c.namespace_id < static_cast<int32_t>(kMaxNamespaceId)))
-          ? static_cast<gpu::CommandBufferNamespace>(c.namespace_id)
-          : gpu::CommandBufferNamespace::INVALID;
+  gpu::CommandBufferNamespace namespace_id =
+      static_cast<gpu::CommandBufferNamespace>(c.namespace_id);
+  if ((namespace_id < static_cast<int32_t>(kMinNamespaceId)) &&
+       (namespace_id >= static_cast<int32_t>(kMaxNamespaceId))) {
+    namespace_id = gpu::CommandBufferNamespace::INVALID;
+  }
   const CommandBufferId command_buffer_id =
       CommandBufferId::FromUnsafeValue(c.command_buffer_id());
   const uint64_t release = c.release_count();
@@ -14490,7 +14491,7 @@ void GLES2DecoderImpl::ProduceTextureRef(const char* func_name,
                                          TextureRef* texture_ref,
                                          GLenum target,
                                          const GLbyte* data) {
-  const Mailbox& mailbox = *reinterpret_cast<const Mailbox*>(data);
+  const Mailbox mailbox = *reinterpret_cast<const Mailbox*>(data);
   DLOG_IF(ERROR, !mailbox.Verify()) << func_name << " was passed a "
                                        "mailbox that was not generated by "
                                        "GenMailboxCHROMIUM.";
@@ -15084,6 +15085,7 @@ error::Error GLES2DecoderImpl::HandleMapBufferRange(
   GLbitfield access = static_cast<GLbitfield>(c.access);
   GLintptr offset = static_cast<GLintptr>(c.offset);
   GLsizeiptr size = static_cast<GLsizeiptr>(c.size);
+  uint32_t data_shm_id = static_cast<uint32_t>(c.data_shm_id);
 
   typedef cmds::MapBufferRange::Result Result;
   Result* result = GetSharedMemoryAs<Result*>(
@@ -15096,7 +15098,7 @@ error::Error GLES2DecoderImpl::HandleMapBufferRange(
     return error::kInvalidArguments;
   }
   int8_t* mem =
-      GetSharedMemoryAs<int8_t*>(c.data_shm_id, c.data_shm_offset, size);
+      GetSharedMemoryAs<int8_t*>(data_shm_id, c.data_shm_offset, size);
   if (!mem) {
     return error::kOutOfBounds;
   }
@@ -15128,7 +15130,7 @@ error::Error GLES2DecoderImpl::HandleMapBufferRange(
   Buffer* buffer = buffer_manager()->GetBufferInfoForTarget(&state_, target);
   DCHECK(buffer);
   buffer->SetMappedRange(offset, size, access, ptr,
-                         GetSharedMemoryBuffer(c.data_shm_id));
+                         GetSharedMemoryBuffer(data_shm_id));
   if ((access & GL_MAP_INVALIDATE_RANGE_BIT) == 0) {
     memcpy(mem, ptr, size);
   }