Select theme resources from ResourceBundle at requested scale factor.

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index 24c05606eead09f08c2297556732a361cfc9aa56..491d7dc25f3901706735a7b8887a34a53d038f8b 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -286,6 +286,33 @@ base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytes(
   return NULL;
 }
 
+base::RefCountedStaticMemory* ResourceBundle::LoadImageResourceBytes(
+    int resource_id,
+    float scale_factor) const {
+  base::StringPiece data = GetRawImageResource(resource_id, scale_factor);
+  if (data.empty())
+    return NULL;
+
+  return new base::RefCountedStaticMemory(
+      reinterpret_cast<const unsigned char*>(data.data()), data.length());
+}
+
+base::StringPiece ResourceBundle::GetRawImageResource(
+    int resource_id,
+    float scale_factor) const {
+  base::StringPiece best_match;
+  float best_match_scale = 0;
+  for (size_t i = 0; i < data_packs_.size(); ++i) {
+    if (best_match.empty() ||
+        fabs(best_match_scale - scale_factor) >
+            fabs(data_packs_[i]->GetScaleFactor() - scale_factor)) {
+      if (data_packs_[i]->GetStringPiece(resource_id, &best_match))

[sail, 2012/05/09 16:09:41]

Worse case this will cause StringPiece to be overwritten 3 times (1.0, 1.4,
1.8). Can we just store the best match index instead?

[flackr, 2012/05/09 19:57:01]

Done.

+        best_match_scale = data_packs_[i]->GetScaleFactor();
+    }
+  }
+  return best_match;
+}
+
 base::StringPiece ResourceBundle::GetRawDataResource(int resource_id) const {
   DCHECK(locale_resources_data_.get());
   base::StringPiece data;