Implement device-ram client hints header

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index e99bb3f585540547c3f4a1749078355f78baea13..f82fde5d37260a20765109806252884c7f4432e4 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -777,6 +777,10 @@ size_t BlinkPlatformImpl::ActualMemoryUsageMB() {
   return GetMemoryUsageKB() >> 10;
 }
 
+size_t BlinkPlatformImpl::AmountOfPhysicalMemoryMB() {
+  return static_cast<size_t>(base::SysInfo::AmountOfPhysicalMemoryMB());
+}
+
 size_t BlinkPlatformImpl::NumberOfProcessors() {
   return static_cast<size_t>(base::SysInfo::NumberOfProcessors());
 }