Change how the quota system computes the total poolsize for temporary storage

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index e1358873a5259d609c310974225a6475060e0ad0..48497f9cd0829d0c5a7846825e3d14e77b1459bd 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -24,6 +24,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/sys_info.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
@@ -2033,6 +2034,82 @@ ChromeContentBrowserClient::GetTemporaryStorageEvictionPolicy(
              : nullptr;
 }
 
+namespace {
+#define UMA_HISTOGRAM_MBYTES(name, sample)          \
+  UMA_HISTOGRAM_CUSTOM_COUNTS(                      \
+      (name), static_cast<int>((sample) / kMBytes), \
+      1, 10 * 1024 * 1024 /* 10TB */, 100)
+
+storage::TemporaryStorageConfiguration CalculateTemporaryStorageConfig(
+    const base::FilePath& partition_path, bool is_incognito) {
+  const int64_t kMBytes = 1024 * 1024;
+
+  if (is_incognito) {
+    // TODO(michaeln): Base the poolsize on SysInfo::AmountOfPhysicalMemory().
+    storage::TemporaryStorageConfiguration config;
+    config.pool_size = 300 * kMBytes;
+    config.must_remain_available = 0;
+    config.per_host_quota = config.pool_size / 3;
+    config.refresh_interval = base::TimeDelta::Max();
+    return config;
+  }
+
+  // The fraction of the device's storage the browser is willing to
+  // use for temporary storage, this is applied after adjusting the
+  // total to take os_accomodation into account.
+  const double kTemporaryPoolSizeRatio = 1.0 / 3.0;  // 33%
+
+  // Determines the portion of the temp pool that can be
+  // utilized by a single host (ie. 5 for 20%).
+  const int kPerHostTemporaryPortion = 5;
+
+  // os_accomodation is an estimate of how much storage is needed for
+  // the os and essential application code outside of the browser.
+#if defined(OS_ANDROID)
+  int64_t os_accomodation = 1000 * kMBytes;
+#elif defined(OS_CHROMEOS)
+  int64_t os_accomodation = 1000 * kMBytes;
+#elif defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX)
+  int64_t os_accomodation = 10000 * kMBytes;
+#else
+#error "Port: Need to define os_accomodation for unknown os."
+#endif
+
+  int64_t pool_size = 0;
+  int64_t total = base::SysInfo::AmountOfTotalDiskSpace(partition_path);
+  if (total != -1) {
+    // If our hardcoded os_accomodation is too large for the volume size, define
+    // the value as a large fraction of the total volume size instead.
+    os_accomodation = std::min(os_accomodation,
+                               static_cast<int64_t>(total * 0.8));
+
+    int64_t adjusted_total = total - os_accomodation;
+    pool_size = adjusted_total * kTemporaryPoolSizeRatio;
+    UMA_HISTOGRAM_MBYTES("Quota.GlobalTemporaryPoolSize", pool_size);
+  }
+
+  storage::TemporaryStorageConfiguration config;
+  config.pool_size = pool_size;
+  config.must_remain_available = pool_size / kPerHostTemporaryPortion;
+  config.per_host_quota = pool_size / kPerHostTemporaryPortion;;
+  config.refresh_interval = base::TimeDelta::FromSeconds(60);
+  return config;
+}
+
+}  // namespace
+
+void  ChromeContentBrowserClient::GetTemporaryStorageConfiguration(
+    content::BrowserContext* context,
+    const base::FilePath& partition_path, bool is_incognito,
+    const storage::TemporaryStorageConfigurationCallback& callback) {
+  content::BrowserThread::PostTaskAndReplyWithResult(
+      content::BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(&CalculateTemporaryStorageConfig,
+                 partition_path, is_incognito),
+      callback);
+}
+
 void ChromeContentBrowserClient::AllowCertificateError(
     content::WebContents* web_contents,
     int cert_error,