Remember value of IsImplSidePaintingEnabled

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index 5dbb2960a22b43cd23fba850b6d7d92b453939e6..2eab547846ce55aaf270bcf2128aa36c4d939171 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -162,7 +162,8 @@ bool IsLCDTextEnabled() {
 #endif
 }
 
-bool IsImplSidePaintingEnabled() {
+namespace {
+bool CheckImplSidePaintingStatus() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
   if (command_line.HasSwitch(cc::switches::kDisableImplSidePainting))
@@ -176,6 +177,12 @@ bool IsImplSidePaintingEnabled() {
   return false;
 #endif
 }
+}  // namespace
+
+bool IsImplSidePaintingEnabled() {
+  static bool enabled = CheckImplSidePaintingStatus();
+  return enabled;
+}
 
 bool IsMapImageEnabled() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();