Index: third_party/WebKit/Source/core/loader/FrameFetchContext.cpp |
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp |
index 0065c6e443491787b7fd6288591f036075c23407..b1bc1d009e1fb72b30fdf1fd3b3e3b1a23e066d0 100644 |
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp |
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp |
@@ -610,6 +610,22 @@ void FrameFetchContext::ModifyRequestForCSP(ResourceRequest& resource_request) { |
GetFrame()->Loader().ModifyRequestForCSP(resource_request, GetDocument()); |
} |
+float FrameFetchContext::ClientHintsDeviceRAM(int64_t physical_memory_mb) { |
+ // TODO(fmeawad): The calculations in this method are still evolving as the |
+ // spec gets updated: https://github.com/WICG/device-ram. The reported |
+ // device-ram is rounded down to next power of 2 in GB. Ex. 3072MB will return |
+ // 2, and 768MB will return 0.5. |
+ DCHECK_GT(physical_memory_mb, 0); |
+ int power = 0; // To compensate of the extra loop iteration. |
Yoav Weiss
2017/05/26 20:48:15
The "compensate" comment seems out of place now
fmeawad
2017/05/30 17:20:59
Done.
|
+ // Extract the MSB location. |
+ while (physical_memory_mb > 1) { |
+ physical_memory_mb >>= 1; |
+ power++; |
+ } |
+ // Restore to the power of 2, and convert to GB. |
+ return static_cast<float>(1 << power) / 1024.0; |
+} |
+ |
void FrameFetchContext::AddClientHintsIfNecessary( |
const ClientHintsPreferences& hints_preferences, |
const FetchParameters::ResourceWidth& resource_width, |
@@ -617,6 +633,9 @@ void FrameFetchContext::AddClientHintsIfNecessary( |
if (!RuntimeEnabledFeatures::clientHintsEnabled() || !GetDocument()) |
return; |
+ bool should_send_device_ram = |
+ GetDocument()->GetClientHintsPreferences().ShouldSendDeviceRAM() || |
+ hints_preferences.ShouldSendDeviceRAM(); |
bool should_send_dpr = |
GetDocument()->GetClientHintsPreferences().ShouldSendDPR() || |
hints_preferences.ShouldSendDPR(); |
@@ -627,6 +646,13 @@ void FrameFetchContext::AddClientHintsIfNecessary( |
GetDocument()->GetClientHintsPreferences().ShouldSendViewportWidth() || |
hints_preferences.ShouldSendViewportWidth(); |
+ if (should_send_device_ram) { |
+ int64_t physical_memory = MemoryCoordinator::GetPhysicalMemoryMB(); |
+ request.AddHTTPHeaderField( |
+ "device-ram", |
+ AtomicString(String::Number(ClientHintsDeviceRAM(physical_memory)))); |
+ } |
+ |
if (should_send_dpr) { |
request.AddHTTPHeaderField( |
"DPR", AtomicString(String::Number(GetDocument()->DevicePixelRatio()))); |