Set ganesh cache limit based on system physical RAM

gpu/skia_bindings/grcontext_for_gles2_interface.cc

Index: gpu/skia_bindings/grcontext_for_gles2_interface.cc
diff --git a/gpu/skia_bindings/grcontext_for_gles2_interface.cc b/gpu/skia_bindings/grcontext_for_gles2_interface.cc
index 1f161413640323a6f505a0557e71f7f5263d5bfa..01a4686409655abe5d46a5b0d87b94e5bbe821da 100644
--- a/gpu/skia_bindings/grcontext_for_gles2_interface.cc
+++ b/gpu/skia_bindings/grcontext_for_gles2_interface.cc
@@ -10,6 +10,7 @@
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
+#include "base/sys_info.h"
 #include "base/trace_event/trace_event.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
@@ -32,10 +33,21 @@ GrContextForGLES2Interface::GrContextForGLES2Interface(
     static const int kMaxGaneshResourceCacheCount = 16384;
     // The limit of the bytes allocated toward GPU resources in the GrContext's
     // GPU cache.
+    static const size_t kMaxLowEndGaneshResourceCacheBytes = 48 * 1024 * 1024;
     static const size_t kMaxGaneshResourceCacheBytes = 96 * 1024 * 1024;
+    static const size_t kMaxHighEndGaneshResourceCacheBytes = 256 * 1024 * 1024;
+    static const int64_t kHighEndMemoryThreshold = (int64_t)4096 * 1024 * 1024;
+
+    size_t max_ganesh_resource_cache_bytes = kMaxGaneshResourceCacheBytes;
+    if (base::SysInfo::IsLowEndDevice()) {

[ericrk, 2017/04/26 00:49:31]

Note that on Android O IsLowEndDevice applies to 1GB devices (not just 512M) - I
don't know that we want to lower our current 96MB limits for these, WDYT?

Instead, we may want to specifically use a kLowEndMemoryThreshold of 512M.

I can go either way, just wanted to make sure we had considered this.

+      max_ganesh_resource_cache_bytes = kMaxLowEndGaneshResourceCacheBytes;
+    } else if (base::SysInfo::AmountOfPhysicalMemory() >=
+               kHighEndMemoryThreshold) {
+      max_ganesh_resource_cache_bytes = kMaxHighEndGaneshResourceCacheBytes;
+    }
 
     gr_context_->setResourceCacheLimits(kMaxGaneshResourceCacheCount,
-                                        kMaxGaneshResourceCacheBytes);
+                                        max_ganesh_resource_cache_bytes);
   }
 }