Global GPU memory manager for android webview

android_webview/browser/gl_view_renderer_manager.cc

Index: android_webview/browser/gl_view_renderer_manager.cc
diff --git a/android_webview/browser/gl_view_renderer_manager.cc b/android_webview/browser/gl_view_renderer_manager.cc
index 13a60fd1fab82d98e6624acadfb54666125c6e7b..b529a301a2e238b7cee13b4cf0780636c5d25686 100644
--- a/android_webview/browser/gl_view_renderer_manager.cc
+++ b/android_webview/browser/gl_view_renderer_manager.cc
@@ -67,4 +67,32 @@ GLViewRendererManager::GetMostRecentlyDrawn() const {
   return *mru_list_.begin();
 }
 
+MemoryPolicy GLViewRendererManager::EvictUntilSatisfied(
+    MemoryPolicy desired_policy, Key key) {
+  AutoLock auto_lock(lock_);
+
+  MemoryPolicy zero_policy;
+  size_t evicted_memory = 0, evicted_resources = 0;
+  ListType::reverse_iterator it;
+
+  // Evicts from the least recent drawn view, until the disired amount of memory
+  // can be reclaimed.
+  for (it = mru_list_.rbegin(); it != mru_list_.rend(); it++) {
+    // key represents the view that requested the eviction, so we don't need to
+    // evict the requester itself.
+    if (*it == *key)
+      continue;
+    MemoryPolicy policy = (*it)->GetCompositor()->GetMemoryPolicy();
+    evicted_memory += policy.bytes_limit;
+    evicted_resources += policy.num_resources_limit;
+
+    (*it)->GetCompositor()->SetMemoryPolicy(zero_policy);
+    if (evicted_memory >= desired_policy.bytes_limit &&
+        evicted_resources >= desired_policy.num_resources_limit) {
+      break;
+    }
+  }
+  return MemoryPolicy(evicted_memory, evicted_resources);
+}
+
 }  // namespace android_webview